Qi Bai's friend Qi Yifei died mysteriously in the dormitory. All the evidence points to Qi Yifei's roommate Lu Qingqian. Lu Qingqian's admirer and rumored boyfriend Qiu Yi, in order to clear Lu Qingqian's name, teamed up with Qi Bai to investigate the truth, and finally uncovered the unbelievable real culprit, which involved a tangled past. This article combines the popular campus youth love and criminal reasoning, with progressive layers and plot reversals. It is brain-burning but also has the unique freshness and innocence of campus love.