Ryeong is the only one in her exorcist family without powers—she can only see ghosts. One night, during the village festival, she encounters Yuseong, a young man possessed by a mysterious ghost. The ghost asks Ryeong to help uncover his lost memories and break the grudge that binds him to the living world. Desperate to escape her family's cruelty, Ryeong seizes the chance to enroll in Mujang-gak, the elite martial arts school run by Yuseong's family. As a female student in a male-dominated world, she faces relentless challenges. Can she survive and uncover the truth to free them both?