Li Xiaogen and Liang Zhongning return to campus late at night and accidentally enter the "Yin-Yang Road." Li Xiaogen encounters the terrifying "human-head tree," after which strange events begin to happen one after another. The campus doctor, Sun Zhaobin, dies at the "Nail Tree," leaving the blood-written characters "Mu Yue" before his death. Li Xiaogen is threatened by an online user called "One Wood," and a misunderstanding causes tension between him, Liang Zhongning, and his girlfriend, Xiao Xingtian. As Yang Peng, Feng Jie, and others are drawn into the affair, everyone grows suspicious of and schemes against one another. They eventually discover that an evil spirit connected to "Mu Yue" is behind it all. In the end, Li Xiaogen and the others try to work together to break the curse, unaware that someone else will have to be sacrificed as part of the plan. The true identity of "One Wood" and the secret behind the "tree on the head" also gradually come to light.
