Ye Wan, a sleep test worker at a haunted house, took over a new contract and moved into an old house where bizarre murders had occurred. The contract requirements are very strange: you must stay for seven days, sleep in the guest room on the second floor every night, and do not open the door to check no matter what you hear. For the past three days, she only heard regular footsteps coming from the attic. In the early morning of the fourth day, she discovered that there was half a cup of warm water on the coffee table in the living room, with unfamiliar fingerprints on the side of the cup. On the fifth day, handwriting carved with fingernails appeared on the inside of the bedroom wardrobe - "He is under your bed." Ye Wan began to suspect that besides her, there was another "tenant" living in this house whom she had never met before.
