Legal analysis: the defendant Chen Moumou is from Fuyuan County, Qujing City, and is an employee of a take-away company. The victim Yang Moumou is from Yao 'an, Chuxiong Prefecture, and is a security guard of a plastic surgery hospital. Chen sent a takeaway to the plastic surgery hospital. Because the delivery time is coming, in order not to be late, he went directly to the plastic surgery hospital. At this time, the victim Yang is on duty. Yang thought that Chen Mou was sending takeout to the plastic surgery hospital and didn't say hello to him. Don't respect Yang, so Yang pushed Chen out of the door. In the process of shoving, Yang hit Chen on the head with his mobile phone, but he didn't listen to shoving. The pizza sent by Chen was knocked to the ground, during which Chen also resisted. Yang entered the hall several times to find a stool to beat Chen, but was stopped by witness Sun. After a short pause, Chen didn't want to pester him any more. He wants to drive away in an electric car. Just after starting the electric car, Yang hit it with a heavy stick from behind. Subsequently, Chen reported the case and waited for it at the scene. According to the injury identification, Chen suffered a slight scalp wound of 4.5CM in the head, a soft tissue contusion in Yang's right hand, a fracture of the first metacarpal bone and a minor injury of Grade II. Subsequently, Chen Mou was criminally filed for intentional injury, and Yang was placed in administrative detention 10 day. Results: After three months' investigation by the public security organs, the case was returned to the procuratorate twice for supplementary investigation. The procuratorate still believes that the facts of this case are unclear and the evidence is insufficient, which does not meet the conditions for prosecution. Chen finally cleared his name.

Legal basis: Article 234 of the Criminal Law of People's Republic of China (PRC) intentionally hurts another person's body, and he shall be sentenced to fixed-term imprisonment of not more than three years, criminal detention or public surveillance.

Whoever commits the crime mentioned in the preceding paragraph and causes serious injuries shall be sentenced to fixed-term imprisonment of not less than three years but not more than ten years; Whoever causes death or serious disability by particularly cruel means shall be sentenced to fixed-term imprisonment of not less than 10 years, life imprisonment or death. Where there are other provisions in this Law, such provisions shall prevail.