Park Yeonseo harbors the secret of being hermaphroditic (intersex).

One day, due to his father's death, Yeonseo is left with the burden of paying off a massive debt. It is at this moment that a suspicious man, Taeshin Joo, appears before him.

Shin Joo disrupts the affairs of his own half-brother and attempts to control Yeonseo's debt, propositioning him with a calculated offer:

"Sleep with me. If Mr. Park Yeonseo cries under me, I'll pay you a thousand [units], if you curse, two thousand, and if you cry and curse, five thousand."

Shin Joo proposes to buy Yeonseo's night...