Just finished binge watching this drama! And oh my, what a ride it was! Both writer and director did a wonderful job creating a suspenseful and brain-twisting drama! A story with multiple time lines isn't easy to portray without everything ending up being too paradoxical. This drama was deep and interesting on so many levels! COMPLEX AND ENGAGING STORY: As a viewer you feel emotionally engaged and connected with the story. You wonder, think and feel together with the protagonists. Often I was left at the tip of my sofa/chair/bed anticipating what will happen next and how the detectives will solve a case. Clues are not given immediately and there are enough twists here and there to keep the story suspenseful and interesting. As a viewer we live and think together with the protagonists on screen. Heartbreaking scenes alert! EYE FOR DETAIL: There are so many subtle clues and details given in every episode that it feels like I need to re-watch the whole series again in order to fully grasp what was actually going on at certain moments. There are also a lot of references to aspects of contemporary Korean society: such as the fascination with celebrities who are dating or not, (unsolved) rape cases, corruption related to hierarchical relationships, etc. which added to the level of realism of this drama. For people who understand Korean, some references are really subtle and make you giggle. (I particularly remember the scene when one of the protagonists asks scoffingly whether the other likes keobchang (pork intestines) or not, however the subtitles just translated it as 'grilled meat'. Some things do get lost in translation. ;)) SUPERB ACTING: Not once I had the feeling that a character wasn't believable. Still now I believe there is still a badass detective such as Soo-Hyun and a moral hero like Jae Han somewhere out there in the real world fighting for what's right! The protagonists can make you laugh, cry and feel utterly frustrated! I would strongly recommend Signal to everyone who's looking for great story-telling with a high sense of realism embedded in a ever-so gripping and intense drama!!! Why are you still reading this?! Go, Go! ;)