Lin Dongxue and Chen Shi met in the bureau. Lin Dongxue asked him, "Do you know why Zhang Hao suddenly took desperate measures?"

"His son betrayed him?"

"Did he say that?"

"Not in detail."

"Two years ago, his son saw him washing bloody clothes late at night. When asked, Zhang Hao slapped him and told him to get lost back to sleep. The son welled up in anger and drew the picture. He also found a knife in Zhang Hao’s drawer and secretly hid it later on. Zhang Hao found that the knife was gone and he was beaten again. The child lied that the knife was lost. In fact, this knife has been hidden by the child the entire time. It was just handed to us with Zhang Hao's fingerprint and his father's DNA."

"This is key evidence!"

"In fact, there was a misunderstanding within. The child told Zhang Hao today that he gave the item to the police. He was talking about the drawing...