"The emperor must be slowly destroyed from within."

The assassin So-hwa enters the palace as a court lady to seduce the tyrant Emperor Yugeon.
However, Yugeon suffers from mysophobia and a severe mental disorder, refusing to let any woman near him.

“If you touch me, you'll be tainted too.”

On a night when the emperor’s madness flares, during his bedtime guard shift,
So-hwa tries to bring him down from within his bedchamber.
But as Yugeon begins to fall for So-hwa, he gradually becomes obsessed with her.