This drama had a well rounded plot with decent side characters. The characters were all likable, but were all pretty cookie cutter basic, we didn't get to know any of the good guys well enough to love them which made me root for the villian at times. The main girl was great in her role as leading detective, however Kim Bum was phenomenal in his role. He has more depth in his twisted character than all the heroes combined, also his acting is extraordinarily frightening! His darkness, devastation and strange devotion to his mom is so perfectly displayed. His devil smile and cocky eyebrows keep you loving to hate him and not wanting it to end. The ending wrapped up as well as I expected but honestly if Kim Bum was not in it, I would say it's fine but you could be watching better things. His performance carries the show, honestly, it's impeccable. His psychopathic subtly is strong enough to keep you afearing for your life and the life of others, the upsetting thing is you find yourself wanting him to win, because he's just too good. That and you really feel for his poor mom whose in denial. They kept showing the main girls family to get us to care but its all pretty tedious, while the Baek and Mom character on the villains end, bring out pity and concern from the viewer. Its sad when you hope a main good guy character dies just to make things more interesting. Kim Bum (Much like Tale of 9 tailed season 1) outranked everyone else once again, he's supurb.At the end of the day I'll wrap it up by saying Rojoon's last words; "It was fun."