One rainy morning, in a small church on the outskirts of the city, it was found that Jin Min Jun, the second year of Yingcai High School, was hung on a cross, tortured, and then killed. This technique was used 16 years ago. This happened in the first year after the team leader of an investigation team, Team Leader Zhang, became a policeman, where a chain of serial murders that used these techniques resurfaced, making old criminals nervous.