A secret room murder case occurred in Changling Village. Xiao Shengxuan, the captain of the criminal investigation team, rushed to the scene and found that the deceased was wearing a terrifying mask, with two strangulation marks on his neck, and human tissue and blood stains between his fingernails. After careful investigation, the criminal investigation team found only the fingerprints and footprints of the deceased Zhang Shichang and his wife Liu Huifang at the crime scene. Investigating the relationship between the deceased and finding out the murderer's motive has become the key to solving this case. However, as the investigation of the case unfolded step by step, Xiao Shengxuan discovered that the deceased was not simple. Although he worked in the No. 4 Hospital of Changling Village during his lifetime, he also secretly did some business of reselling antiques and had complicated relationships with the outside world. Moreover, his father Zhang Yuanshan also passed away some time ago. According to witnesses, the scene was also a "suicide while wearing a mask."
After Zhang Shichang passed away, Liu Huifang first invited the painter Liu Ziyan to hand-paint a portrait of the body. Unexpectedly, during this period, some bizarre incidents began to occur one after another in the house, and her daughter Zhang Yumo and the painter Liu Ziyan were also involved. Just when Zhang Yumo thought the door to happiness was beginning to open to her, the true identity of painter Liu Ziyan also surfaced. Zhang Yumo never imagined that she would be surrounded by people wearing strange masks.
During this period, Xiao Shengxuan, the captain of the criminal investigation team, also led his team members through extensive digging and finally found the major suspect in the case. Just when everyone began to breathe a sigh of relief, another murder case occurred in Changling Village.
