A hundred years after the end of the world, Shen Yan relied on the "eternal fire" to survive, and smoothly traveled around all forces. During a transaction, he accidentally ran into Ling Shuang, the leader of the arrogant mercenary group, who was surrounded. He rescued him, but he got into trouble - a bully male partner snatched supplies, a hypocrite set a trap, and a psychologically twisted suitor stalked him. To make matters worse, the two accidentally trigger the "Twin Guardian" mission. If they don't complete it together, the eternal fire will be extinguished. The positions of good and evil collide, Shen Yan's smoothness collides with Ling Shuang's arrogance, from mutual dislike to life and death dependence.
