Only Him (Triangle Love Story_OC_SEHUN_JONGIN_EXO)

This story is about a kingdom in Joseon era. You are Kim Hyeseo, the princess of the kingdom. You have an older brother, Kim Hyunseo the crown prince (Kim Junmyeon). You are very smart and beautiful. Your brother has a friend, Jongin, and he really likes you. But, you don't like him because you have already liked someone else. You met him when you secretly sneaked to the village to know the life outside the kingdom. One day, your father (the king) wanted you to marry a son of his trusted minister. He is Oh Sehun. At first, you don't like it at all, but then, when you know that he is the one that you met regularly at the village, you can't help to think that your life will be so perfect. However, one thing that you don't know is that Sehun is born with a gifted power of magic that your kingdom will not approve anyone with that kind of ability. They will ask them to leave the kingdom or for worse will kill them because of the dark history that was caused by the people who have that ability to the kingdom.

What will you do when you know it? What will your father do when he know it? Will you protect him and betray your kingdom?