i loved this drama personaly, i like how they have a acualy well writen serial killer character, most media dont give the killer motive or backstory and just have them as one dimentional psycho killers, bit in this you sort of understand a little bit why he is the way he is without simpathising for him since he is still a murderer.

i think they should have had a bit less comedy especially towords the end, plus i hated the ending i think it just trivalizes the whole story and you end the show not invested in the characters anymore