Gong Wei is a mainland public security special police officer. He was dispatched to Hong Kong for a secret mission and became an undercover detective of a criminal group headed by Fu Guang. case. When Gong Wei participated in an underworld transaction, Officer Zheng rushed to the scene to fight with the underworld. Gong Wei pretended to hold Officer Zheng hostage to cover Fu Guang's departure, and female police officer Yihua came forward to rescue Officer Zheng. After Gong Wei and Fang Yihua fought, Fang Yihua found that Fu Guang actually protected himself while fighting, which surprised Fang Yihua. When Fang Yihua went to Beijing to understand the situation, he was told that Gong Wei had escaped from prison. At the same time, Gong Wei called his son Jian Jian and left his contact information. Fang Yihua came to Gong Wei's home and firmly believed in his father. Fang Yihua also knew the identity of Gong Wei's special police officer. This is, Zhuo Ling, Gong Wei's wife, asked Fang Yihua to bring it to Gong Wei himself, and then passed away. Fang Yihua came to Hong Kong with Consolidation, and Fu Guang drowned Consolidation in order to test Gong Wei's loyalty to him, but Consolidation was suffocated by Gong Wei's training since he was a child, and he deceived Fu Guang by virtue of this. With the cooperation of father and son, Fu Guang was finally imprisoned