On the bustling streets of Hong Kong, all kinds of vicious crimes are on the verge of breaking out. Therefore, the agile, calm and capable Flying Tigers (SDU) have become an important guarantee for the safety of citizens, and the snipers of the Flying Tigers have become the key to determining the success or failure of the operation. Sniper Gao Jinjian (played by Zhang Zhaohui) is calm and sophisticated, and has rich experience. He also undertakes the important task of training the younger generation, but often laments the lack of elites. Shangguan Tian, the boss who promoted and valued Jinjian, and his daughter Mingzhu (played by Xu Zishan) are also a criminal police officer of O Ji. She has a reckless personality and vows to become a heroine. Mingzhu has a close relationship with Jinjian and Li Haoyang (played by Xie Tianhua). Haoyang was once a comrade-in-arms who was as strong as Jinjian, but because of his overly flamboyant style, he left the police force and switched to become a businessman. Behind his serious business, there are also hidden secrets. The elite of the police force, close comrades-in-arms, ruthlessly collided in the hail of bullets...