巩伟是一个内地的公安特警，他因为一次秘密任务被派遣到香港，成为了以甫光为首的犯罪集团的卧底侦查案件。巩伟参加一次黑道交易的时候，郑警官赶到现场和黑道厮杀，巩伟假装挟持郑警官掩护甫光离开，女警方逸华出面救下郑警官。巩伟和方逸华动手后，方逸华发现甫光居然边打边保护自己，这一点让方逸华十分惊讶。方逸华到北京了解情况时被告知巩伟已经越狱的消息，同时巩伟给儿子巩固打电话留下自己的联系方式。方逸华来到巩伟的家中，巩固坚持相信自己的父亲，方逸华也知道了巩伟特警的身份。这是，巩伟的妻子卓玲拜托方逸华带去给巩伟自己的绝笔，随后就撒手人寰。方逸华带着巩固来到香港，甫光为了考验巩伟对自己的忠心，把巩固淹死，但是巩固从小就被巩伟训练憋气，靠着这一点骗过了甫光。父子一起合作下，终于让甫光入狱

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