Before joining the team, LI Xicheng was a hero who fought fire. Although he has a glorious past, the harsh reality hits him hard. In order to train the recruits into real special-duty elites, YE Qiheng, the deputy captain, has made a special training plan to hone the mentality and will of LI Xicheng and the others. After trials of life and death like the fire in the warehouse, the chemical leakage, the serious car accident, and the serial explosion, LI Xicheng truly realizes from the bottom of his heart that as a special-duty fireman, he has more to face than those dangers. During the arduous growth along with WEN Yibing, a fire investigator who can never be over Accident 102, and the other teammates, in face of the brotherhood from the past, LI Xicheng sees the nobleness in this team. In the end, LI Xicheng finds a lifetime cause worth fighting for. That is to become a frontline fireman, a true hero in harm's way, who is willing to sacrifice his life to honor his loyalty.