In the shadows of Mt. Bukhan, a lonely tiger spirit discovers the corpse of a man and seizes the chance to live among humans in his body. Dreaming of love but armed with raw instinct, he stumbles through human life until he meets Suhyeon, a quiet young man with a shaman grandmother who sends him to confront the unruly spirit. But when a protective charm breaks, the tiger’s suppressed desires explode, and he becomes fiercely obsessed with making Suhyeon his mate—promising to protect him for life, no matter what.