I recommend this drama. The drama is basically just whats listed above (Action, Friendship, Investigation, Thriller). The writers must have had specific things in mind and stuck to what they think is right. I liked how the drama went, my brain enjoyed it. Props to the writers for sticking to their thing and not sacrifcing the story or plot for entertainment and high ratings. I'm rating this drama based on: story (well written) -The plot was consistent it had many twists and unexpected turn of events. I was even anxious on the days when episodes were released, waiting for subs and wondering what happend. The drama can glue you to your seat ( or bed wherever you watch it). But I don't recommend starting it with the normal kdrama expectations. As it's said "Story about a group of people who get together to overcome their pain of having lost their loved ones to crime." they don't work together to replace their loved ones, so don't watch it if you are gonna expect a lot of romance and if you are very into this gener. This is a very intense drama with very serious problems in society. Like I said it's very consistent and the writers didn't go off their way in the story with some other genres to get higher ratings. The other the great thing about this drama is how well the characters are written and that there are strong female leads.( I really like that) acting/cast (great) - I think that in this drama Lee Shi Young really shined as an actor. She also had great chemistry with Kim Young Kwang. Both actors were able to portray the characters, the tension and their relationship very well. I'm also glad to see that Key, Kim Seul Gi, Kim Tae Hoon got bigger roles. All of them are very talented, but I have to say that its great that Kim Tae Hoon got to play such a nice role! I'm impressed because so far I had only seen him do well as a villain.(Angry Mom). music(surprising) - I love to soundtrack, it really fits the drama and when it plays you know something is gonna go down. Idk but for some reason it reminds me of the movies Taxi(minus the tons of action), because when black eyed peas' track was played I would be like yeaaa. When the music starts. now I'm like oooooooo~ :D - I would rewatch it for sure Overall I really liked this drama and I'm very content with it and I was able to see some actors in a whole new way. So I'm giving it a 10.... ( the last ep. were meh, but ok)