Eun Seon-myeong is a hunter and exorcist who carries two curses. He's on a mission to kill Shim Yi-yul, a fire fox, but instead, they form an alliance and start living together. Despite their initial dislike and wariness of each other, they manage to coexist. However, during Shim Yi-yul's heat cycle, their instincts take over, leading to a night spent together. After that night, their relationship transforms into something a little different.