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Physical therapist Kim Dan has been down on his luck for as long as he can remember. Between an ailing grandmother, menacing loansharks, and an old boss making it almost impossible for him to find work, Dan is truly running out of options. Naturally, it feels like a dream come true when he’s finally hired to treat top-paid MMA fighter Joo Jaekyung, especially when the man then calls him out for a treatment the night before a match with an oh-so-tantalizing offer of five thousand dollars. He claims to have a “jinx” in need of a particular type of “treatment, but its one that Dan isn quite prepared to offer… You see, Jaekyung may be a beast in the ring, but he’s even rougher in the bedroom, and Dan’s not sure he can survive Jaekyung at his most primal. Nevertheless, the promise of much-needed cash has Dan agreeing to this ill-fated deal... Could a night together be the thing to help Jaekyung break this jinx once and for all?

In the mid-Joseon Dynasty, a king was so cruel that it was hard to even speak of him. People called him the 'Yaksha King' because he was a demon who devoured people. Yi Shin, who ascended to the throne and reigned as the king of Joseon, had a reputation as a cruel king. When there was a shortage of eunuchs to serve him, the court offered high wages and even accepted eunuchs instead of sons. Seong Han applied to be a eunuch to pay for medicine for his seriously ill mother and thus entered the palace. He caught Yi Shin's eye and became his night attendant...