I started watching Signal because it was directed by the Kim Won-Seok, and won Baeksang Art Awards for Best Drama in 2016, the same as My Mister in 2018. To be honest, the first few episodes got me hooked, but later on it became painful to finish and I almost quit (twice) in Ep 7 and Ep 15.

The production is excellent, granted, acting isn't really bad, just average, OSTs are not memorable, but the story is ruined by too much "grandfather paradox" from time traveling. We can never really apply logic to any time travel novels and movies, because it's not logical from the start.

What I like most about this drama is its key messages: injustice that always favors the riches, and "never give up." What I hate most, perhaps as much as illogical time travel, is the stupidities of protagonists--all three of them. At one point, they seemed smart, but then made a series of same stupid decisions. Well, that may be our nature to do something stupid repeatedly, but for a drama, I don't think it's fun to watch our protagonists succumbed to their stupidities too many times.