After Huo Yan graduated from the Civil Defence Academy, he becomes the vice-captain of the Fire Rescue Team. During an incident where he had to rescue a pregnant woman from a delivery car, he met Yan Lan, a doctor working in the Emergency Department. Their meeting started out on the wrong foot, plagued with misunderstandings. Huo Yan has always been cold and level-headed, having a firm grip on all situations. However, the appearance of "sunshine" Yan Lan becomes the only uncertain element in his life. Huo Yan and Yan Lan meet again in an earthquake relieve mission. During their mission, they are constantly faced with extreme conditions, witnessing countless parting caused by life and death; causing their relationship to take a stronger turn. After returning back to the city, news of a highly infectious virus broke out. Yan Lan and her colleagues immediately devote their efforts, joining the battle to combat the disease. Huo Yan and the people who received their aid are constantly worried about Yan Lan's safety and try all means to silently support Yan Lan behind her back. On the other hand, Jiang Tong, the deputy instructor of the Fire Rescue Team falls in love with Wang Dayin, her fellow colleague who seems timid and withdrawn. Faced with Wang Da Yin' constant avoidance and her family's opposition, Jiang Tong is determined to find out the story behind Wang Da Yin. In the process, Wang Da Yin also gradually mature to become a man with a sense of mission and responsibility.