Don't jump to conclusions about anything, let alone guess, or you will get hurt.
As the movie begins, "In a world where black and white are indistinguishable, never guess".
Extended data:
A Brief Introduction to the Story of the First Commandment
"Miscellaneous Affairs Office" is the department in charge of abnormal events, especially supernatural events in the police force. Li Guoqiang, Xinzha's brother, was transferred to the department after being killed by a serial killer wanted for many years while on patrol. He also met with Sir Huang, the eccentric and alcoholic supervisor, who solemnly announced the first commandment of "miscellaneous services":
There are no ghosts in this world! But in fact, this is just a beautiful lie-not only did they encounter a lot of paranormal in the process of law enforcement, but even Sir Huang himself was caught in paranormal.