I am seeing this because of Jisung, who is the second lead. His acting is up to my expectation. His role allows him to apply his excellent acting skills. He acts like a crown when in a scene he is humiliated by a powerful minister. But as the story develops he becomes an aggressive minister who successfully let his son to be the king.
The first male lead and the young king both are ok. The plot is quite rich and enchanting. Jisung's son surprisingly becomes the king. And it ends with the first male lead, a fengshui expert, giving advice to Korean fighters where to set up the military school. It makes me think of Mr Sunshine.
The movie is centered on fungshui, where the location of ancestors' grave determines the well being of descendants. Fengshui can hardly be understood by Westerners. Hence the low rating.