In the year of 1762, when King Yeongjo of the Joseon dynasty's been ruling for 35 years already, Crown prince Sado is accused of plotting treason by his biological mother lady Yi. Yeongjo falls into a dilemma since he could not penalize his own son as a traitor as it would mean that he would become the father of a traitor threatening his throne, and ends up ordering Sado to take his own life.
