In ancient times, there were many strong men, and the power of blood destroyed the world. After years of accumulation, the bloodline was diluted and degenerated into human beings. However, the bloodline of saints is still passed down to this day, hidden in the world. They use powerful powers to maintain the balance of the world. In the name of an angel, we protect the world as an Angle Agent—an angel agent! Able to do everything except murder! Hong Ye, Angel Agent No. 099, Accepts his agent mission for her partner whose whereabouts are unknown, and comes to the human world to find the agent - his partner's son, Ling Fei. Assassinations came from all directions, forcing Hongye and Lingfei to keep moving forward to find their missing father, whose life and death were unknown...