It is best to watch Detection of Di Renjie first then this. This is the sequel to Detection of Di Renjie and continues the story after Di Renjie's girlfriend succumbed to the hit she received at the ending of that film.

This one i think is better than the prequel although the actress who played Ms Luo I think is mediocre and disnt seem to fit with the characters in this film.
Production is neat and good. Wardrobes, locatoon and props perfectly meshes with the scenes.

I am wondering who played the doctor because I couldnt find him on the list of actors/artist provided here. (After searching, it is Wen Zhuo who played thr part of ShoBai, the doctor)

This is highly recommended if you are a Di Renjie fan.