Cheng Lifeng's parents died when he was young, and he was not favored when he stayed with relatives. He dropped out of school due to school violence, and then began to mix in society, becoming the right-hand man of Hong Siying, the boss of the Jiying Gang.
Another gang, the Tianmen Gang, had a long-standing feud with the Jiying Gang. During an assassination, Cheng Lifeng was attacked and was pushed off a cliff when he was dying. When he was about to die, a planarian accidentally entered his body. Because Cheng Lifeng had one extra chromosome than ordinary people, and this extra chromosome could combine with other animals, Cheng Lifeng was resurrected and gained some special abilities of planarians, such as regeneration of severed limbs, etc. So he came back for revenge. . .
Purpose: Gaining superpowers accidentally and coming back for revenge