Yeonwu Chae, a talented yet lonely composer from Korea, finds herself and her family trapped in the underworld after a car crash. In her first life, she marries Hyojo, who ultimately kills her. In her second life, she takes revenge by taking her own life in front of him. But despite her desperate wish for an end, she’s given another chance at life. However, this time, instead of encountering Hyojo, she is discovered by Hwita, a mysterious man with a black wolf as his guardian spirit. Can Yeonwu break the cycle and find true safety in this treacherous underworld?