Qingtang Apartment

The architectural structure of the century-old Qingtang Apartment includes a deliberately hidden fourth-floor space, and each room has "souvenirs" from past tenants. Lin Shen, a graduate student in the Department of Folklore, moved into Qingtang Apartment to prepare for his thesis. On the night of the first rainstorm, he discovered that the corridor structure was abnormal and the elevator button mysteriously disappeared with the sign on the fourth floor...