Seven Days Mystery

A strange murder suddenly occurred in Longjiang City, which had been silent for a long time. The dismembered corpse, the strange church, the mysterious seventh day, what mystery is hidden behind this? What mystery is hidden behind the murderer's consecutive crimes for seven consecutive days? Just when the police detectives were at their wits' end, they suddenly remembered Ren Jie, the "master" who had resigned long ago. Under the leadership of Ren Jie, a four-person team was established. What challenges will they face?