Yeonwu Chae, a gifted but isolated composer from Korea, finds herself thrust into the underworld with her family after a fatal car accident. In her first life there, she becomes the wife of Hyojo, a man who ultimately betrays and kills her. In her second life, driven by vengeance, she ends it herself in front of him. Yet, even as she prays for escape from this endless torment, she is reborn once again.
This time, instead of Hyojo, she crosses paths with Hwita, a mysterious figure accompanied by a black wolf as his guardian spirit. Can Yeonwu finally break free from the relentless cycle of suffering and uncover a path to safety in the perilous underworld?