The King, unable to consummate his marriage with the Yuan Princess Queen due to his homosexuality, orders his personal bodyguard and lover Hong-lim to sleep with the Queen to produce a royal heir. What starts as a forced duty quickly turns into a passionate sexual affair as Hong-lim and the Queen fall genuinely in love, arranging secret nocturnal liaisons in the palace library.
Suspicious of their behavior, the King instructs guard Han-baek to spy on them and catches Hong-lim and the Queen engaging in sex inside the library. Enraged and heartbroken, the King orders Hong-lim castrated and imprisoned. However, the Queen announces she is pregnant with Hong-lim's child, saving her from immediate execution, while loyal members of the guard help the mutilated Hong-lim escape the palace.
To lure Hong-lim back, the King executes everyone who knew the secret father's identity and falsely hangs a severed head outside the palace, making Hong-lim believe the Queen was executed. Driven by rage, Hong-lim storms the palace and engages the King in a brutal duel inside the royal hall, mortally wounding him. As the King lies dying, he asks Hong-lim if he ever considered him a true lover, to which Hong-lim coldly replies, "No."
Moments later, Hong-lim catches sight of the pregnant Queen watching from a window, realizing the King lied to him. Before dying from his own wounds inflicted by the King, Hong-lim turns his head back toward the deceased monarch, leaving his final feelings unresolved as both lie dead together.