Story:
Something I frequently found myself saying was "WOW this is crazy!" because the plot is so unpredictable and there are so many cliffhangers and plot twists that you just want to keep watching. Throughout the series, you wonder what is going to happen to Lee Jae Han, and things take a major turn in the last few episodes and things really get C R A Z Y. The ending is kind of ambiguous but I think it just sets the stage for a second season, which HAS to happen. Otherwise it's super unsatisfying.

It's a crime drama, but at the same time all the cases are connected and lend themselves to the bigger picture of the plot. It was really interesting to think about how the past/present changed because of the walkie talkie and the actions of the main characters. The writing is good and it moves along fairly quickly, although this is definitely a heavier drama since it covers topics like rape, murder, etc. This is a drama that tugs at your heartstrings and makes you sad and angry at injustice. The cases are also based on real events, which is so devastating to think about. There's a sense of continuity in the drama, where the beginning episodes are equally important to the plot as the later ones and it all ties together, so you should definitely pay attention to everything!

Acting/Cast:
Signal has such a stellar cast, including one of my favourite actors Kim Won Hae. He's appeared in what feels like every single drama, but he's such a good actor although he didn't play a big role here. There were lots of familiar faces in the cast, and I can't think of a single one where I felt like the acting was weak. You will hate the villains, and rail at injustice and then remember that it's just an actor and not real life.

I was especially impressed with the female lead (Cha Soo Hyun), who appears in both the past and the present. The way that she portrayed herself from 15 years ago vs present time were so different and made it believable. Sometimes I feel like in dramas, scenes from the past come across as kind of fake or not believable that the actors are really younger (just dressed in different clothes) but this felt really real.

Music:
The theme song really fits in with the old time feel of the show, and I had it stuck in my head but then for some reason midway through they swapped out the song for a few episodes. I'm not sure if this was because of the plot or whatever, but then they went back to the original song. I can't remember the second song, but the first song is a solid 8/10.

Rewatch Value:
If crime/suspense dramas aren't your thing, I would highly recommend watching with someone.
I actually started watched Signal a few years ago when it first came out and then dropped it, but always remembered it as being a good drama despite that. I think it's just a very emotional/heavy drama and I usually prefer romantic comedies, but this time I watched it over Netflix Party with my boyfriend and I think it definitely helps to have someone to buddy watch with! It's not a show that I would recommend binge watching, more like watching one episode a day so things don't get too dark.

Honestly a really good drama. Get ready for suspense, cliff hangers, plot twists, and all the feels.