This is the famous cold-hearted King Celestine. You’re his personal guard/knight but not out of your own will. Although you’re super talented you just want to help your sick mother get better and live with her happily, but you’re poor and can’t afford medicine. So, the king has taken advantage of this and manipulates you into staying by his side by helping cure your mother. But, he has no intention of letting you leave even after your mother is cured.