Be warned that this is NOT a BL drama! This way you won't be disappointed and post hateful comments because you don't like the fact that the ML and the FL can end together.

I saw so many hate towards the FL and when I ended the drama my thought was "we watched the same drama??" I just loved Youming! She is brave, smart, determined and will do everything to protect Lu Yao, who is a genius but lazy, weak and coward. They are perfect together. I just loved the three leads, their friendship. I've already watched a numberless of detective dramas, series etc, and for me, the protagonists and their dynamics are almost more important than the cases and My Roommate is a Detective delivered both: very likable characters and enjoyable cases.
The drama has its flaws but overall is very funny and a I think you should give a chance if you like detective stories.