A 21-year-old young man is handsome, very enthusiastic towards people, and has a kind heart. He does not have any mental illness and everything is very normal. He suddenly kills people for no reason and the method is very cruel. The victim has no grievances against him. He has no relationship with the victim and he does not know the victim. Why is this? His family couldn't understand, nor did his relatives and friends. Even the police, procuratorate, and court were surprised. Only he knew that he deliberately killed people like this. There was a secret buried in his heart, which pushed him to embark on this road of no return, which is sad.