Hwiun of the Celestial Realm, though an immortal, committed the sin of being too lustful. Uryeong of Hell, though a goblin, committed the sin of being too kind. As punishment, they are cast down to the human realm and given the task of performing duties befitting their original roles. Meanwhile, in the human realm, lived a girl named 'Miji' who grew up under a clumsy, foolish father, having never even dreamed of contact with men. Due to such excessive control, she ironically became ravenously hungry for desire towards the opposite sex. Witnessing this, Hwiun and Uryeong decide to use her to fulfill their respective tasks.

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