Lin Mo, who has both legs amputated, was complained by his neighbors about tap dancing in the middle of the night. When the police investigated, they found that the noise actually came from a vacant building upstairs. After everyone investigated, they discovered that Chen Feng, the son of the homeowner, imprisoned his ex-girlfriend Li Na in a wooden box and deliberately let the cat make noise to confuse the audience. After the case was solved, Chen Feng's misdeeds such as matricide and the use of horrific recordings were exposed one after another. A year later, the strange noise in that building reappeared.
