For me, there were two things I waited in the last episodes. one was the cause for sun ho killing and it was, entertainment and such. I will say acceptable. the other is the cause for the professor's doing and it was, entertainment also! not acceptable for me. okay I will move to sth else it might be ridiculous or whatever. if the group had just 1 brave or a violent man. after the first kill after reset, they could have easily threatened lee shen maybe some very very light torture as a threat and make her confess everything then, end of the story :DD but they just kept talking 2 words to her and go after that the other come tell her 2 words and go although she knew their deaths they just kept doing this. Now, lets conclude. I will put it like this. although it might contains some plot holes and such, I really don't don't care. why? because, I really enjoyed this drama the acting the feelings the ost, and its ending was really beautiful. and my rating is 9\10
second, lets give it a try.