Lu Chengfeng, a time traveler with high IQ, was asked by Han Liming to undercover Qiang Sheng Group. In order to avoid military training, he planned to molest Wen Ruyu and was expelled. He went to the detention center to subdue Lao Hei. Later, he gained Sang Dasheng's trust by killing Scar and Sang Biao, but he was entangled by the eldest daughter of the Sang family. He dealt with all parties, saw through Sang Dasheng's temptation, and finally used a trick to obtain the account book, arrested Sang Dasheng, and proposed to Wen Ruyu.
