Jooho, a tiger from an abandoned zoo, transforms into a human. Heon, possessing a mysterious power, is the one who turned Jooho into a human. The two spent their childhood together like brothers, but Heon's mistake leads to their separation. Ten years later, Jooho receives an urgent call from Heon.
"We have to meet right now. The spell is breaking."
The two reunite, and there, Jooho hears a rather shocking method to reinforce the spell.
"You have to... have sex with me for a hundred days."
Can Jooho safely get through these hundred days and become a complete human?