My roommate is a detective : the title tells almost all. The action takes place in Shangai during the chinese republic era, so the settings and wearings are quite beautiful. Solving crimes is the big part of this drama but what is more interesting is the main leads interactions and backgrounds. Caring interactions grow smoothly and joyfully with some very hilarious scenes between the 3 main characters. Who is really loving who ? Who is fooling who ? How family matters will interfere in everyone's life ? You'll have to guess and bet how things will turn out. And this is quite thrilling ! I was watching this drama for Hu Yi Tian (detective Lu Yao), but indeed Leon Zhang (police officer Qiao, previous top gangster) was much more amazing and looked quite charming wifh a golden heart !