This is a materpiece i can say, the only less realistic thing is Ko Mo Chi, no matter what happened he could "feel" that it was made by a psychopath even tho nothing seemed like that. Ba-reum and Seong Yohan both were complex charachters. I really liked Bong-yi, because she wasnt that sensitive ass girl what i usually see in korean dramas. Its really long but i never boring. I loved the fact that i had absolutely no clue what will happen next, this show its one of the best ive ever watched and i totally recommend it.