Alice (Aelriseu / 앨리스)

"Do not get sad looking at the past."

"It isn't coming back."

"Improve the present that you're in."

"That's yours."

"The Book of Prophecy"? What is that?

If you're her son,

how can you not know that?

Is that what killed my mom?

Just what is in that book?

The end.

"The end"?

Yes.

The end of time travel.

Could you explain in a way that I can understand?

I didn't get a good look at it, so that's all I know.

My teacher told me not to look at it.

Who's the teacher?

Why are you looking for my teacher?

Just tell me.

You think I'd tell you?

Even if I did, you wouldn't be able to find them.

Nobody knows whether they're a man or a woman,

or how old they are.

But I do...

because I saw them myself.

Did you ever ask why she was looking for the teacher?

Because of her son.

Jin Gyeom.

I told you to just go.

He's not your dad?

What a relief.

Did you find out why your mother visited him, then?

No.

Do you know which police department arrested him?

The Songpa Police.

(Seoul Songpa Police Station, Unsolved Murders)

(Case on Dr. Jang Dong Shik's Murder)

Why are you looking into this?

(Blueprint of the site of the incident)

I don't know,

but I think this may have something to do with my mother.

(The suspect was found in the elevator.)

Do you know this man?

I don't think I can leave you alive.

That's him.

How can he be in a photo from 1992?

Are you sure this photo is from 1992?

That doesn't make any sense.

If we get him, we might be able to solve...

Yang Hong Seob's murder case, Hong Eun Soo's kidnapping case,

as well as Jung Gi Hoon's murder.

We could solve all of that at once.

As well...

as my mother's murder.

(Missed Call Professor Yoon Tae Yi)

Why is Park Jin Gyeom suddenly investigating a case from 1992?

Any possibility that someone may have clued him in?

Not a lot of people know the 1992 case.

Who could possibly give any information on that?

It wouldn't have anything...

to do with Tae Yi, right?

Just as you said, not a lot of people know,

but one of them is Tae Yi.

There's no way Tae Yi would betray us.

Let's keep a close eye on Park Jin Gyeom...

and see who he is in contact with.

Yes, sir.

I must've dozed off because I was tired.

I slept for exactly 10 minutes.

When did you get here?

It has been 1 hour and 25 minutes.

Did you find something?

Yes, I did, but...

Did you come empty-handed?

You knew I was pulling an all-nighter.

How could you not bring anything?

I'm hungry and I want coffee.

I'll get it later, so tell me first.

Then I'll tell you later.

I'm too hungry. I don't have the energy to explain.

Maybe if I had a pastry...

Which pastries should I get?

Whatever. I like all types of pastries...

except what I don't.

Wow. You're amazing.

How did you pick all of my favorites?

Anyway, thanks.

Now tell me what you found.

But first, promise me this one thing.

You can't tell anyone what I'm about to tell you.

I signed a confidentiality agreement...

when I left the lab.

If this gets out, I'll be blacklisted.

In Hawking's paper on chronology protection conjecture,

he proved that time travel is impossible.

But there's a condition.

That if negative energy exists, time travel is possible.

That is why I was researching the Dirac sea.

Please explain what that is first.

Hawking's paper?

No. The Dirac... Sea?

Why don't you know that?

Do you not know the Dirac equation either?

How could he not know that?

Then I'll try to explain it in layman's terms.

All masses move in the direction in which energy is exerted.

Only negative energy moves...

in the opposite direction from which energy is exerted.

My research was using negative energy to open a wormhole.

This was the command program from back then.

But...

this card that you gave me...

had a similar program.

Of course, I know this makes no sense,

and it can't be explained logically,

but a program similar to the one I've been researching...

is on this card.

Did you work on that research alone?

No. There were five of us on the team.

Director Seok was the head researcher.

He was a senior researcher at the time.

How did you end up joining that team?

Director Seok came to my school and asked me to join his team.

When?

Do you know that we had...

a super blood moon back in 2010?

Yes.

I first met him at an event that day.

What's wrong?

My apologies.

I don't think I can keep it a secret as I promised.

What do you mean?

Detective!

What brings you here?

You intentionally approached Professor Yoon, didn't you?

What were you and she researching?

How is it related...

to my mother's death?

I apologize,

but I can't tell you that yet.

You are extremely important to me,

but it'll be difficult for you to understand right now.

That's how I was 10 years ago too.

Ten years ago?

Do you like cats?

Find a case related to Schrodinger's cat.

Then you'll believe me.

Stop playing games.

Just answer my question.

What are you doing?

Detective!

Listen to me.

I don't know why you're doing this,

but if I find anything suspicious,

I'm arresting you first.

I'm sorry, sir.

It's okay.

Why do you get so worked up whenever you see Director Seok?

You would've hit him if I didn't stop him. Are you a gangster?

You're a detective.

I understand that you want to catch your mother's killer, but...

You won't understand.

I became a cop to catch my mother's killer,

and I searched for 10 years.

But now, I don't know who my mother was anymore,

let alone the killer.

The more I dig into her death,

the more clueless I become...

about who my mother was.

That's why I'm scared...

and want to know more.

Why are you drinking water while talking about something like that?

Do you want a drink?

No, I'm fine.

I should take you home too.

I'll do whatever it takes to figure out how to use the card,

so chin up.

Is your stereo broken? Why won't it play anything?

I don't have any saved. I don't listen to music.

Do you listen to the radio?

I don't listen to the radio either.

What do you do when you drive?

I drive.

Here. My TA gave it to me. I'll give it to you.

It has many of the newest songs.

You should keep it. I really don't listen to music.

It's because you don't listen to music, that you have no emotions.

Force yourself to listen.

Based on the records,

Lee Se Hoon's legs were fine immediately before the crime.

But when he was arrested, his ankle was cut off.

What's more baffling is, that ankle...

was completely healed as if he had lost his foot long ago.

Isn't that weird?

Let's meet the detective who was on point at the time.

Lee Se Hoon? Of course, I remember.

It was 30 years ago, but you remember his name.

Because he was the oddest guy I had ever arrested.

He had no ID, his prints weren't in the system,

and he never said anything even until the bitter end.