If something goes wrong, I will take full responsibility. – Cha Soo Hyun

I can't let it end like this. – Park Hae Young

I think it's worth a try. – Park Hae Young

Hae Young: What do you think it would be like if you could get to communicate with the past?

Soo Hyun: I would ask someone to protect a person important to me.

If I do nothing, I'd regret it too. Isn't it better to try something even if it becomes a mess? – Cha Soo Hyun

The past can be changed. Don't ever give up.

Cold cases are all about finding what past detectives missed. – Cha Soo Hyun

You can't ever let emotions cloud your view. Don't let your emotions get the best of you. – Cha Soo Hyun

I'm going to turn things back to before... if I still have a chance. – Park Hae Young

We can catch the killer and save people.

I would do anything for my son. – Lee Chun Goo

If I'm choosy about facing men and women, I should turn in my badge right now. – Cha Soo Hyun

If you don't trust me, don't ask me to do it. – Kim Gye Chul

They didn't pass away in the arms of their loved ones. They died on the cold ground shaking in horror. – Park Hae Young

Crying can be a good method. Just find a good way to get over it, whatever it is. – Lee Jae Han

We must really be the aces. – Kim Gye Chul

If the past changes, the present will change.

It's dangerous to change the past too carelessly.

Once a garbage, always a garbage. – Kim Bum Joo

I did everything wrong. Everything is ruined because of me. These transmissions never should have started. – Lee Jae Han

If I had been by her side, I could have saved her life. – Oh Kyung Tae

We ruined everything, so we must put everything back in place.

I can change the future. – Lee Jae Han

It was you who couldn't do anything despite being by her side. – Ahn Chi Soo

He was just a victim too. If you were in his place, you would've done the same thing. If you wanted to revenge, you should've done it properly. – Park Hae Young

Were you afraid to get revenge on stronger people? – Park Hae Young

The person who ought to be punished is probably living well and happy. He must pay for the crimes he committed now. – Park Hae Young

If you have money and power, can you live happily and well no matter what awful thing you do? – Lee Jae Han

I think I can catch him. No. I will catch him for sure. – Lee Jae Han

Even if you change the past, some things remain. The world will always be unfair.

­­Do you know who I hate the most? An idiot who runs around thinking he has something others don't. – Kim Bum Joo

If you got a message from the past, I asked you what you'd do. You said that you'd give it a try rather than not trying and regretting even if it makes a mess. But I think you're wrong. It's best to ignore those messages. Things could get really messed up. – Park Hae Young

Even if I get fired, I will put you away for murder. – Park Hae Young

He can't bear to lose to someone he thinks is lower than him. – Park Hae Young

Those pieces of trash, they dare go up against me? I'll face him head on. – Han Sae Kyu

At that moment, was it really just a coincidence that this radio fell into my hands? Why did it have to be me? Why me and why did these transmissions start? – Park Hae Young

She will overcome it. She is very determined. – Lee Jae Han

You should tell her that yourself. If you think that to yourself, the other person will never know. If you tell her yourself, it will be a great source of strength. – Park Hae Young

It was really painful. But what can I do? Someone has to catch them. – Lee Jae Han

I have to get him so that this nightmare will end. – Cha Soo Hyun

You can't let things end this easily. Never. – Cha Soo Hyun

There are those who are born monsters, but there are also those who are made into monsters by people. If someone, if just one person had held out a helping hand, they could have been saved. – Park Hae Young

We can't decide other people's lives.

These cold cases exist because someone gave up on them. So, you should not give up.

In exchange for the lives that were reclaimed, I don't know what misfortune has fallen on another.

Evil is not far away; it is in our midst. They are still among us.

There are many who have done wrong, but none who have been punished.

No matter what happens, a police officer should not be swayed. You should be fair and open in your investigation.

I have to know the truth. I need to know why my brother had to die like that. Even if I have to die, I will find out. – Park Hae Young

You could end up taking the fall if this goes wrong. – Cha Soo Hyun

I have to know something in order to help you. – Cha Soo Hyun

You said that you trust me, right? I feel that way too. You're all I have. – Cha Soo Hyun

He took the fall without knowing a single thing. – Park Hae Young

If I had known that would be the last time, I would have done something, something small at least, and leave something behind. That's what I regret the most. – Cha Soo Hyun

Whenever a door opened, I wished he would walk through those doors. As if nothing happened, while calling out my name, I wished he would come in like that. I wanted that. – Cha Soo Hyun

You asked me to wait until the weekend. It took 15 years. You broke the promise first. – Cha Soo Hyun

I was alone. I thought I was alone. That had been the hardest part. – Park Hae Young

I'm going to pursue it until the end. I had forgotten something important: I cannot give up or turn my back on it. – Lee Jae Han

I want you to be happy, having people by you and being with those you love. – Park Hae Young

I will not give up. No matter what happens, I will go on until the end. – Lee Jae Han

He was the only person who was genuine with me. – Kang Hae Seung

I'm going to start over again too. I'm not going to give up on my life. – Park Sun Woo

Do you know what the hardest part about it was? It wasn't my fault, but people pointed fingers at me. – Kang Hae Seung

I'm going to make you confess all the wrong deeds you have done. – Lee Jae Han

Maybe not now but in the past, I'm sure there's a way.

This must be your method. You find people's weaknesses and exploit them. – Lee Jae Han

He is still alive through this radio.

You said you had something to say to me. You told me to wait for you. I waited so long for you. – Cha Soo Hyun

If we can save his life, if there is even a small percent chance, I will do it even if I ruin everything. – Cha Soo Hyun

As for me, for sunbae and for you, I will not give up. – Cha Soo Hyun

I thought that everyone had turned their backs on it. He, alone, had never given up. – Park Hae Young

The world doesn't always turn in your favour. – Lee Jae Han

More than the fear of death, it was more unbearable for you to leave all those cold cases, right? Did that desperation lead you to me? Please live on with that willpower. – Park Hae Young

I kept my word. – Lee Jae Han

I have to right the real wrong, so that I can change the past and the future too. – Lee Jae Han

Something else has changed.

There is only one thing we're sure of: the transmission started out of one man's desperation. 

One thing that voice over the walkie-talkie has taught me was that things work out if I don't give up.

If we don't give up, it's all possible.

If we don't give up, there is hope.