This is going to be short (here's to hoping). I didn't had much expectation going in. Because I didn't thought the story will be this much addicting as it was. I waited until it had enough episodes out, before starting to watch it. And thank god that I did. Because I watched those 12 episodes in one day at a stanch. I just couldn't stop. Can't stop. Waiting for the last four episode was a misery. I like all the episodes. The story goes a little slow at first but the second half is somewhat mind-blowing. And then the ending. Some will say, that the end wasn't nice. They didn't liked it. But I personally think that it was perfect. I loved it.One of my favorite ending, ever. Some time the sad-slow ends are what we need. The story has some holes in it. It is a time traveling story and this type of stories always has some thing like this. So that was not unexpected. And because of the amount of Time-traveling drama is around right now, not many people will feel good about it. And then there is 'Signal' and I am sure a lot of people are comparing this with that one. Don't do that. They are not same. The story in it's self is different. Every thing was resolving around a case that starts 30 years ago. One giant mysterious case. And it's our cop's job to solve it. But the little one around it is what I loved about it. They just didn't show you the murders but what it does to the people around that victim. They are suffering, their pain. And I loved how they honored them in the end. Because it's always about saving life not the thrill in catching the culprit. I love all the people in the cast. They are all new to me. But I didn't mind. They drew me in. I liked how they portrayed their characters. Specially Lee Yoo Young. Her character was smart, cold, controlling and no where near the 'sweet-innocent-damsel in distress' type and I loved that about her character. And she pulled it off with an ease. Choi Jin Hyuk ( welcome back!! ) and Yoo Hyun Min were amazing in their roles. The little bickering and bromance (Though it should be called something else. 60 year old and 27 year old man romance'?) between them just lightened the dark-gloomy scenes a little. Though most will complain that Choi Jin Hyunk's character had some 'issues' in the last episodes. I just want to state that no one is perfect. So isn't a character. Their flaw is what makes them different form another and special. For Kwand Ho it was calling bad guys 'Jerk'. His a 1980's cop. Cut him some slack will ya'? Kim Min Sang. I have only one thing to say about his character and about him. This is how a ** should be like. I am going to re-watch this because I love the love story in this drama. Yes there is one. And I am not talking about Yoo Hyun Min and Lee Yoo Young's characters. But about Park Kwang Ho and Yeon Seok. Their longing, their pain, their love for each other is one of the best thing about this drama. That sweet little love story twirled in to the bigger story, some how complemented the whole thing. It was the motivation that both of this characters needed. And I love those type of stories. For those who are thinking if they should watch it or not. I would like to tell you to give this a try. Trust me, you are going to thank me later. So watch it!