Lin Yi (Cheng Yuanyuan) and her boyfriend Sun Wei (An Hu) are developing an underground love affair in full swing, but at this time, the police suddenly come to Lin Yi's home and tell him that Sun Wei has been dead for a long time; the lights of the building opposite where Chen (Hong Chen) lives appear at the same frequency every night, and the boy who talks to her every night seems to have an unspeakable secret with another girl; Liu Yihao (Zhou Baihao) often sees the woman in the building opposite screaming for help, but when he notifies the police to rescue her, he is surprised to find that there is no one in the room... What secrets are hidden behind all this? They have encountered bizarre experiences and even face the threat of death. For this reason, they are willing to uncover the truth at all costs.