An anonymous tipster, Chen Zhen, implicates a drug ring in his sister’s death. Tension escalates when the victim’s mother confronts Zhang Donglan after his release.

A raid on a nightclub uncovers new evidence. A crucial clue from a surveillance camera refocuses the investigation.

The suspect's alias and tragic past come to light. Luo Weizhao takes a more personal approach to uncover the truth.