Tong Song, who has disabled legs, is the founder of Mao Dun Security Company. There are two other people in the team, namely An Ning, who is good at machinery, and Daniu, who is simple-minded and has great skills. The company's main business is to protect the personal and property safety of customers, commonly known as "bodyguards". On this day, they received an anonymous three-day commission to protect An Ning's sister An Yi. Since then, An Yi has had frequent accidents. Tong Song believes that the incident is not accidental, and he found clues in the details, which confirmed his guess. Behind it may be an organization that is good at creating accidents to kill people invisibly. At this moment, An Yi disappeared...