(Train)
(This drama is fictitious and names, places, organizations, incidents,)
(entities, and jobs are unrelated to real life.)
That night 12 years ago.
That's when we went into two different worlds.
I met Seo Kyung. But you didn't.
- That's why... - This world is...
very different from your world.
It's time you go back to where you belong.
I'm going to catch him. The real killer is someone else.
He kills people the same way he killed your father...
and leaves a piece of jewelry there that he took from your house.
That is his signature.
There he comes. The victim's son.
- I saw him. - He has a spot...
on the back of his left hand.
Lee Sung Wook isn't the killer. There's an accomplice.
- He's the real killer. - But I found out...
that you were also a victim.
- I'm sorry. - You were right.
Eventually, I have ruined your life.
Then, let's go back to that day.
April 8, 2008.
The culprit was in the house. When I went inside.
What about his face? Did you not see his face?
I guess you really can't avoid fate.
This is an antipsychotic drug.
It's normally prescribed to patients with Huntington's disease.
I checked the list of evidence and photos of the crime scene,
but I also didn't see a prescription bottle anywhere.
That means the culprit came back.
It was probably a kind of drug that could easily reveal his identity.
Mr. Seo? I thought you were at the nursing home.
It's you. The reason that jerk won't leave this world.
That jerk changed a lot of things.
Father.
Father!
I'll look inside.
Father. Father!
Father!
Get up.
Do Won.
It's you.
The owner of this necklace.
It wouldn't be bad...
for father and son to die at the same time.
It may seem like the end, but it's not over.
In the end, I didn't get to catch you myself,
it's not over.
I will eventually catch you.
Father!
Father.
Mr. Seo.
(Train)
(Nakwon Funeral Hall)
(Episode 9)
Mr. Seo.
Do Won.
What happened?
Ms. Oh.
Father!
Father.
Hang in there.
Do Won.
What happened?
Mr. Seo...
How did this happen?
(May 12, 2020, John Doe 3)
Please run his fingerprints.
And find out who this guy is.
What happened?
What on earth happened to him?
(Match, Scanning completed)
(Name: Seo Do Won)
Who on earth are you?
The real Seo Do Won is dead.
Who are you?
I am the dead Seo Do Won.
And the dead Seo Do Won...
is me.
(Match, Scanning completed, Name: Seo Do Won)
From another world?
Mukyeong Station is the connection between these two worlds.
On rainy nights,
at 9:35pm,
Train 8210 arrives at Mukyeong Station.
Do you expect me to believe that?
Then, how else can I explain myself being in this world?
When I was in the 10th grade, I hurt my arm in gym class.
I'm sure you remember that too.
You were the one who went to the hospital with me.
It was 12 years ago when the world split into 2.
Since then, everything has changed.
The real culprit used the boundary to cover up his murders.
I don't understand this at all.
I neither follow what you're saying nor know who you are.
We just have a different memory of 12 years ago.
In the world I was in, and even in this world, you are...
my only friend.
I don't care who you are...
or where you came from.
To me, you're not the Do Won I know.
The Do Won I know...
died today.
Because of you, he had to die as a John Doe.
No one will know that he died here tonight!
I need some time...
to understand the person I have been working with...
and to figure out what to do now.
I need time to think.
(May 12, 2020, John Doe 3)
The surest way to confirm that would be checking my body.
I will consent to any tests you ask for.
I have...
never done drugs.
I know I was the suspect of Lee Jin Sung's death...
and put Kim Jin Woo in jail even though he was innocent.
But I don't care who I was or how I lived in the past.
The only thing I can do right now is to do what I can in this world.
And right now, all I know is that Kim Jin Woo isn't the culprit.
Lee Jin Sung was killed because he saw the real killer.
He's the one who took and killed Jung Kyung Hee.
Other than them,
there are more missing people that he killed.
I myself saw their bodies.
(Nakwon Funeral Hall)
We checked the surveillance cameras at the nursing home,
but we didn't see anyone else other than your father.
So you're telling me that he went outside...
because of delirium?
That's what the doctors claim.
That's how it looked in the footage, and his room was a mess.
End-stage liver cirrhosis patients often show delirious symptoms.
The hospital will be held responsible...
for not taking care of him properly.
And the Traffic Unit is investigating the accident.
Thank you.
Why isn't Inspector Han coming to the funeral?
Do you think she won't come at all?
I don't know.
(Mukyeong Station)
A train.
A different world.
(Mukyeong Police Station)
- Dr. Seok. - Seo Kyung.
I forgot to give this back. It's your jewelry box.
Oh, right.
No one was in the office.
Did something happen?
Yesterday, Mr. Seo Jae Chul died...
in an accident.
Only Seo Jae Chul died?
Hello, I'm Han Seo Kyung from Serious Crime Team Three.
Are you in charge of the hit-and-run case that killed Seo Jae Chul?
- Yes. - On route 95...
where the accident occurred,
right before the intersection where the surveillance camera is at,
there's a side road.
Here. This is the memory card from the dashcam of a car...
that was parked on that road last night.
If the victim used the side road to escape, it'll be in there.
Do you know the victim?
He's my boss' father.
Please look into it.
Back then,
what if I wasn't the detective in charge?
Do you think that would've changed things?
Where did it all go wrong?
You should go home.
You didn't get enough rest since yesterday.
(Rest in peace.)
Dr. Seok.
(Chief mourner: Seo Do Won)
How is he still alive?
Thank you for coming.
It's you. The owner of this necklace.
I was shocked when I heard the news.
I heard it was an accident.
Yes, unfortunately.
Just a second.
Does he not recognize me?
- Hello? - Sir.
They found the hit-and-run driver.
Okay, I'll be right there.
In the end, I didn't get to catch you myself,
it's not over.
I will eventually catch you.
(Mukyeong Police Station)
Sir, you're here.
I'm Woo Jae Hyuk from Serious Crime Team Three.
Where's the hit-and-run driver?
Don't come near me! Go away!
My life is pretty much over.
I have no reason to live.
- Calm down and put that... - Don't come near me!
Please put down the scissors.
How dare you think of dying so easily?
Let's see who wins.
Isn't that a skeleton?
Park Tae Kyung?
Mr. Seo.
Ji Young.
Isn't he Lee Ji Young's boyfriend?
This is him?
This person must be Lee Ji Young's acquaintance.
Call him.
(Janghae Foods)
We found this photo in Lee Ji Young's wallet...
along with the business card.
Actually, we called him a few days ago.
Park Tae Kyung turned out to be Lee Ji Young's boyfriend.
We couldn't find her address because she was living with him.
He didn't report her missing because she often left home...
whenever they had a big fight.
The guy who hit my dad...
was Lee Ji Young's boyfriend, Park Tae Kyung?
Could this all really be...
a coincidence?
How did the accident happen?
That night, he took tranquilizers before driving.
(Diazepam)
It was Ji Young's.
When the police called...
and said that Ji Young could be dead...
Do you think that's an excuse?
There were no skid marks.
You didn't even get out to check if he was alive.
I really didn't kill them both.
What do you mean "both"?
I went back...
to the site.
But...
Tell the truth. Did you see clearly?
His face too?
It was too dark for that.
Mr. Seo.
There were two people down?
He's been talking nonsense all along.
There was only one victim. I bet he was hallucinating.
(May 12, 2020, John Doe 3)
- That scar... - I have to go.
That's odd.
I thought he got it erased.
What?
I'll try not to...
disappoint you again.
When all this is over,
let's start afresh.
(May 12, 2020, John Doe 3)
What are you doing?
Strangulation marks.
(Marks caused by being choked)
Wasn't it an accident?
Someone was chasing my father.
That's why he was on that road.
The only person who'd hurt him now.
The person who must cover up the case from 12 years ago.
It was all him.
The real killer.
Do Won was killed by...
the real culprit?
It's not a coincidence.
Before and even now,
everything is connected to him.
I may be a piece of trash,
but you lost your father, while I saved mine.
You saved no one.
But I was different.
You were right.
Yet again,
I saved no one.
However many worlds there are,
however many of you there are,
I decided to think of only one thing.
The kind of person that...
I know you to be.
Is that why you came to this world...
to catch the culprit?
He killed...
the person I love.
She was killed for seeing him.
Just like Lee Jin Sung.
Keeping her safe.
Not letting her suffer.
That was my justice,
and the reason I could live.
But...
I failed to protect her.
Just like how he killed my father twice.
What do you mean?
My father didn't die in an accident.
I feel like the same things keep happening.
That...
scares me so much.
I'm afraid I'll lose everything again.
I'll stop him this time.
Whatever it takes.
It's you.
The owner of this necklace.
Dr. Seok.
He definitely died.
So how come...
You have a visitor.
Please show him in.
(Mukyeong Police Station)
Inspector Han.
Your mother's jewelry.
We're done testing them, so I came to return them.
Would you like to talk?
Do you believe...
what Do Won said about another world?
Maybe I want to believe it.
If another world really does exist,
my mom and dad,
people I can never see again...
are living there safe and sound,
I'd like to see them at least once.
Even if it's just once.
I don't know.
I cannot...
accept him as Do Won...
that easily.
The Do Won I know...
Mr. Seo doesn't know...
about your past relationship, does he?
It was me who couldn't stay with Do Won...
as he kept changing.
We fought a lot. And I hated him a lot too.
But despite everything,
I still loved him.
But he doesn't have those memories.
He can't be my Do Won.
A while ago, Mr. Seo said something like this.
As long as his loved one was alive in whatever form...
That would be enough for him.
I think...
I can understand where he's coming from.
Your father didn't pass away in an accident?
It's under investigation.
Are you telling me it's a homicide?
Only one person would want to hurt my father.
The person who doesn't want my father to regain his memory.
But the people who knew that he tried to get his memory back...
Only Inspector Han, you, and I...
knew that.
If the information leaked,
we must check where the source was and to whom.
This article was published even before Ms. Han asked me...
for the hypnotherapy session.
I don't think the information was leaked.
It was never concealed from the beginning.
Do you have any other questions?
No. I took up much of your time.
Thank you for coming yesterday.
Do you have siblings?
Why do you ask?
Never mind. I thought I saw someone who looked like you.
I don't have any siblings.
I see.
I must have been mistaken.
He saw the other me.
It's me. I have a question.
Didn't you do a clinical trial...
for Huntington's disease?
It's been only three years since the symptoms started to show.
Can the patient already experience dementia?
No, the patient is young.
The patient knew it was hereditary.
The younger the patient is, the faster the disease develops.
It isn't entirely impossible.
Usually, patients experience dementia in their 40s.
How are his symptoms?
The patient saw a man die in front of him,
but the patient saw the same guy alive the next day.
When he looked into it, there was no record of the death.
The patient can't even be certain if his memory of losing...
or getting an object back is real or not.
The patient was curious...
about how much time he has left if he's already...
experiencing dementia.
(Mukyeong Residential Murder)
(Stolen Jewelry: 13 pieces)
The number doesn't match.
Yes, Mr. Seo.
- Are you home? - Yes.
You're okay, right?
Pardon?
I was just wondering if you were okay.
Mr. Seo, in your world, six female corpses were abandoned.
And you only found six pieces of my mom's jewelry, right?
That's right. Why do you ask?
I got the jewelry back.
But I'm missing one.
What do you mean?
Do you think the real culprit left one out?
Inspector Han.
You cannot act on your own starting now.
Wherever you go, you must report to me first.
If something happens to you, call me right away.
Wherever you are or whatever it is.
Promise me that you will.
Okay.
I have a question.
In your world,
did you meet me?
I was just curious.
Just like you said, did anyone look out for me?
To help the 17-year-old me...
not get lost?
Perhaps,
you might have been there for someone in that world,
so that person doesn't get lost.
I hope so.
It'd be nice if I...
in a different world am living a happy life.
I'm sure you are.
Absolutely.
So the culprit kept a piece of jewelry.
No! Someone, help me!
Save me.
(Voice Memo)
- How does it feel to die? - No. Don't do it.
- That's how I felt all my life. - Stop it.
Please spare me. Spare me!
I saw my end.
Don't be so sad.
You're not the first.
And you won't be the last.
There's one more person left.
Someone whom I should've killed first.
But that person will become my last.
(I'll let you choose again...)
No.
The last one should be a bit different.
("My Sweet Orange Tree")
Seo Kyung, it's me.
(Mukyeong Police Station)
The first person to go missing...
was Lee Sun Mi who disappeared three years ago in May 2017.
Yoo Min Jung disappeared in December 2017.
Park Hye Jin and Choi Eun Kyung...
each disappeared in February and April 2019.
Lee Ji Young and Jung Kyung Hee each disappeared in April and May.
I left out Jo Young Ran since we know why she was murdered.
What are the common features of the victims?
Apart from their gender, they were all different ages,
had different jobs, and went missing in different places.
Do you think the culprit chose the victims randomly?
No.
There has to be a common feature as to why they were targeted.
All the victims...
disappeared near their houses or workplaces.
That means the culprit...
was very well aware of the victims.
And it can't be a serial murder committed by a psychopath...
seeing that the cycle is too irregular.
During that time,
the culprit must've looked for reasons to murder the victims.
I agree with Mr. Seo.
The culprit committed his first murder 12 years ago.
Based on Lee Sung Wook's last words,
it was an unplanned murder...
that was committed while trying to steal jewelry.
And the fact that he started...
killing people again after 9 years in 2017...
surely means there's a reason he chose these victims as targets.
And what else? Do you have anything more?
The culprit is probably in his early 30s.
He was living in this area,
but his uniform didn't belong to any of the schools here.
It's highly possible that he went to a specialized school...
such as a foreign language or a science high school.
And right now,
I'm guessing he's a white-collar worker.
And...
he's suffering from a rare illness.
A rare illness that can easily get exposed...
just by checking the kind of medicine he takes.
She's the victim's family.
She's here to collect the victim's belongings.
Have you still not found my mother's body yet?
I'm sorry.
We need to find her body so we can give her a funeral.
I feel so bad for my mom.
She was so ill...
because she spent all her life working.
By any chance, did your mother take alprazolam?
She showed signs of a panic disorder.
She didn't take medicine saying they make her too sleepy.
But I told her to carry them around just in case.
I put them in her bag.
That night, he took tranquilizers before driving.
(Diazepam)
It was Ji Young's.
Did any of the other victims...
take psychoactive drugs by any chance?
I'll check.
(Mukyeong Psychiatric Clinic)
Hey, you're here.
Hey, I noticed no one is outside.
I wasn't supposed to have any patients today.
Thank you for agreeing to change the schedule.
Sir, I just checked with the organization,
and all the victims had records of having seen a psychiatrist.
But the thing is, they all went to the same hospital.
Mukyeong Psychiatric Clinic.
Dr. Seok Min Jun. He's 34 years old.
(Personnel Information, Name: Seok Min Jun)
And he graduated from Hanyang Science High School.
Is there any progress with the investigation?
We're still looking for him.
But we're going to catch the culprit no matter what.
How did taking revenge on the culprit...
become my reason for living?
Unlike me, some people lived to protect someone.
Once we catch the culprit,
I want to make sure he gets punished by law.
Mr. Seo Jae Chul forgave me before he died,
so it's the least I can do for him.
Yes, of course.
Because if it weren't for him, you would've died that day.
What do you mean?
Why don't we talk a bit more about that day?
About that day 12 years ago.
What did you say happened...
before you came home and saw the crime scene?
After I finished school,
I was going to drop by the bookstore.
But it suddenly started raining.
And I didn't have an umbrella.
So I just decided to go home.
Then why didn't you go home right away?
- Well... - The killer...
was in the house until Mr. Seo came in.
If you had come home early as usual,
he would've killed you,
and where Seo Jae Chul lay,
you would be lying instead.
Beside your dead father.
That's what I'd have done.
If I were the killer.
Some choices save lives,
and some kill.
But even when they're...
given a chance to pick a choice that will let them live or die,
some people keep taking the road that'll kill them.
That is called fate.
Do you have the DNA result?
Fortunately, some of his sweat was left on the incense stick.
I was able to get a DNA sample.
Beneath the fingernail were some skin cells and blood.
It showed up on the toxicology report.
It's tetrabenazine, prescribed to...
people with Huntington's, a rare brain disease.
This jerk...
(Inspector Han Seo Kyung)
Ms. Han, it's me. I identified the real killer.
It's Seok Min Jun.
He's the real killer.
If you'd found out a little sooner,
your father wouldn't have died.
Right?
Why did you answer this phone?
Where is Seo Kyung?
Search carefully.
Like how you found me.
Where would she be?
The person you have reached is not available.
Please call again later.
(Woo Jae Hyuk)
It's me.
Trace Seok Min Jun's phone...
and put out a BOLO for his car now!
Where is Seo Kyung?
I'll turn myself in.
I killed people.
Many people.
(Train)
Will you live as a predator that hunts...
or as a bug that gets eaten?
You left that evidence in my locker...
with my fingerprints on it, didn't you?
How could you do that to me?
Not reporting me while knowing that I killed your mother?
- You did that. - I...
I always did what you asked me to do.
I want my dad to die.
I want to kill him.
- Then kill him. - You can do that.
I didn't kill him. I didn't do it.
Don't come closer.