Who Is the Murderer in 520 Dormitory?

As a young and promising captain of the city's criminal police, when he received the 110 order, he still hoped that it would be a false alarm, a fight between students and injuries, or even a sudden accident. He didn't want the murder to happen in an ivory tower like a university campus. These students, after years of hard study, entered university with their parents' expectations. Their beautiful lives had just begun. It would be a pity if an accident occurred or harmed others.