Detective Gao Nuts: a Mystery That Has Been Hidden for 20 Years

One day, a vicious murder occurred in the town: in a residential building in the Dongcheng District of the town, a family of young and old were brutally killed. In response to this vicious case, the police hired Gao Nuts again to help solve the case. Later, when Gao Nuts was helping Sheriff Olive sort through the information, he suddenly discovered a vicious case from 20 years ago. The murderer's modus operandi was almost exactly the same this time. It is very likely that the murderer from 20 years ago committed the crime again. After investigation, the murderer of this and the case 20 years ago has surfaced.