Huo Yan (Gong Jun) graduated from the Fire Academy and became the deputy chief of the fire station. During an incident of cutting and dismantling taxis and rescuing pregnant women, he met Yan Lan (Zhang Huiwen), an emergency doctor. The two met because of a misunderstanding. Huo Yan, an "old cadre", felt that Yan Lan, the "little sun", was the only uncertainty in his life, and their relationship was ups and downs. During the cross-provincial reinforcement of an earthquake, Huo Yan and Yan Lan's feelings were sublimated after witnessing the various separations and deaths caused by extreme conditions. The fire-fighting and medical cooperation allowed them to experience a series of rescue events such as rescuing beekeepers. Yan Lan, who had medical ideals, gave everything he had to save the dying and the wounded, while Huo Yan and all the other people who had been helped silently supported Yan Lan in their own ways. On the other hand, Jiang Tong, a new firefighter, gradually fell in love with Wang Dayin, a firefighter who seemed to retreat and fear things. Caught between the strong opposition of his family and Wang Dayin's hiding, Jiang Tong wanted to explore the story behind Wang Dayin, and in the process, Wang Dayin gradually became a man with a sense of mission and responsibility.