Ah Chuan (played by Zhang Xiaoquan) is a man with a very gentle personality. One day, he suddenly fainted while working. However, after a doctor's examination, he found that there was nothing wrong with his body. The doctor diagnosed that Ah Chuan might have a mental illness. Ah Chuan returned to his hometown for recuperation, where his father Wang Bobo (played by Wang Yu) and sister Xiao Yun (played by Huang Xiangqi) lived. What Uncle Wang didn't expect was that Ah Chuan actually killed Xiao Yun. Uncle Wang locked Ah Chuan in a small house and dealt with his daughter's body alone. Xiao Yun's husband hadn't seen his wife for a long time and came to the door. Just when he was about to find Ah Chuan's hiding place, Uncle Wang killed him. The disappearance of Xiao Yun and her husband attracted the attention of the police. Two policemen locked Uncle Wang and approached the small house where Ah Chuan was, but were killed by Ah Chuan. In order to cover up the crime for his son, Uncle Wang took all the blame.