Tyrant Yeonsan(폭군연산(복수,쾌거편))

Prince Yeonsan-gun turns into a tyrant out of grief for his mother's death. He orders beheadings of all the officials who displease him or who advised the previous king to depose the queen. He becomes crueler by the day. But in 10th year of his reign, he is kicked out of the throne and dies a tragic death. -IMDB