Heo Doh is the first prince in line for the crown, but everybody seems to favor his younger brother over him. Even his newly promoted eunuch, Hae-min, sneaks off to spend time with the younger prince. When Heo Doh walks past Hae-min’s quarters early one morning, he happens to witness the eunuch doing something thought to be impossible: masturbating while moaning the younger prince’s name. The possessive and jealous Heo Doh questions Hae-min, but he denies that event ever took place. So, Heo Doh makes it his mission to prove that Hae-min isn’t impotent after all...