In order to investigate an old case, Lu Chengfeng borrowed the identity of his late brother Lu Songwen to enter the Qiang Sheng Group to collect relevant clues. During the period of lurking, he was jealous of Wen Lanlan, excluded by people within the group, and experienced the betrayal of his subordinate Allen. Lu Chengfeng relied on his cool mind to deal with all parties and resolve crises time after time. When Mr. Dou planned to gather forces to attack him, Lu Chengfeng promptly contacted the law enforcement agencies and launched a coordinated operation to capture the entire illegal gang. The case was successfully solved, Lu Chengfeng regained his true identity, and the past grudges were settled. After that, he walked with Wen Lanlan and started a new life that was solid and stable.