The Treacherous (2015)

This 18+ korean porn movie plot:
Based in the Joseon King Yeonsan’s reign, this film deals with the king and his servant and a treacherous subject who butters up the king.
King Yeonsan-gun exploits the populace for his own carnal pleasures while his treacherous retainer controls the tyrant king and the world, and a woman seeks vengeance.