When they were in elementary school, Song Huai and Qin Yang were classmates, and they could be considered childhood sweethearts. Qin Yang always told Song Huai that he wanted to be a firefighter. Later, Qin Yang actually became a firefighter and went through fire and water for Song Huai. Qin Yang became Song Huai's light.
Concept: Everyone has his or her own light in their heart. Qin Yang and Song Huai are like this. They became each other's salvation and light for each other because of a fire.