Li Xicheng (played by Ren Jialun) was a fire-fighting hero before he joined the team. He joined the team with a halo, but was deeply hit by the ruthless reality. In order to hone this group of new members into true "special service elites", the squadron deputy captain Ye Qiheng specially made a training plan to hone the character and will of Li Xicheng. After experiencing life and death tests such as warehouse fires, chemical leaks, major car accidents and serial explosions, Li Xicheng truly felt that as a fire special service member, he faced not only dangerous situations, but also the growth of teammates and partners such as fire investigator Wen Yibing who was obsessed with the 102 accident. In the face of the past life and death and comradeship, Li Xicheng saw the noble soul of this team. In the end, Li Xicheng found the career he had been fighting for all his life. He became a real retrograde hero on the front line of the fire brigade, going through fire and water for loyalty.