After a year on my plan to watch list I finally got the time/vibe to watch this drama, and didn't sleeping well for two days was really worthing! Signal is not the kind of drama that everyone will like it, but at the same time is the kind one that grabs and take over your heart and mind. The way that they develop the story and how the things start to make sense is totally amazing! The most crazy thing about this plot is how you start to find out the link between the characters and the cases that they investigate.. The writers did an amazing job here, after one/two episodes you're already hooked to this crazy/amazing drama! One of the strongest point of this drama is the cast: Lee Je Hoon as Park Hae Yeong is perfect, his expressions, his big lips, the crazy look he has when he's profiling someone, his tears.. are really on point! I dunno another works from him, but after this drama I'll definitively stalker him around. Jo Jin Woong as Lee Jae Han is really good too, I really like the development and how the actor portrait this specific character.. Cha Soo Heyon is not my favorite kind of female character, just for the fact that I feel like almost all her judgements are kind of based on her feelings for Lee Jae Han. But, on the other side, is really cool to watch this strong and amazing woman that doesn't seem afraid of fighting for the right thing. Kim Hye Soo was really cool on the acting scenes and I really think that she has a crazy chemistry with Lee Je Hoon; I shipped Detective Cha with Park Hae Yeong all time long! Overall I really enjoyed watching this drama and I couldn't stop until I had finished it.. Everything was done pretty well and it's impossible to not like it.