The Throne
사도 (original)
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.
Starring Yoo Ah-in, Song Kang-ho, Lee Hyo-je, So Ji-sub, Moon Geun-young, Jeon Hye-jin, Kim Hae-sook, Park Won-sang, Jin Ji-hee, Lee Dae-yeon
Watch "The Throne" on Tubi TV released in 2015. It's a drama and history movie, and has a rating of 7.1 out of 10 from Imdb which is usually fine for this kind of movie, and is currently available to watch for free.