Who is the star detective Zhen who was killed?

Liang susu. The murderer of Zhen was Liang Susu, who was Zhen's ex-girlfriend. Liang Susu was very jealous of the relationship between Zhen and his current girlfriend, so he decided to kill Zhen. In order to achieve this goal, Liang Susu secretly got Zhen's key, stole his fingerprints at night, and then opened the door with Zhen's fingerprints and killed him.