There are thousands upon thousands of demons in the world, and half of them reside in Night Glow City. As for the other half, they all died in northern Dark Jade City, the one under the High Constellation Immortal Xiao Fuxuan. Only one demon was imprisoned for twenty-five years and still lives. And he is Night Glow's city lord, Wu Xingue.

Yeyul is the youngest princess who is unloved and neglected. She lives in fear of getting killed by her father, the tyrant emperor. However, she is about to turn her fate around as she is actually a reincarnated soul, with the knowledge of how the story would unfold. Withstanding mean siblings and untrustworthy servants, Yeyul must now strive to survive on her own within the tyrant’s palace.