Although Di Feisheng's surname is Di, he is just a killer trained by the Di family. When he was a child, he killed his best friend with his own hands in order to survive.The head of the Di family had long told him that no matter how hard he studied and practiced, he would not be able to break through the eighth level of the Sad Wind White Poplar and take revenge.
Di Feisheng's body was probably planted with a poison. If the head of the Di family shook the bell, he would have a splitting headache and lose all ability to resist.Had it not been for self-mutilation and more serious pain to overcome the poisonous bite, it would have been difficult for Di Feisheng to escape from the devil's cave of the Di family.