Jiang Chengyi: male protagonist.Captain of the criminal police team.He is handsome, has a calm personality, and has a good family background. He was a god-like figure in high school.After breaking up with Lu Yan, she chose to leave City S and go to City B to study criminal investigation.After graduation, he stayed in city B to work. He was hard-working and capable, and was quickly promoted to captain.Soon after being transferred back to City S, he took over the death case of Lu Yan's colleague and reunited with Lu Yan.