Dae-won

You are the youngest of five princesses of a kingdom named Sylen, the most sheltered sister, being forbidden to leave the palace all the time due to your heart problems (you were born with a weak heart) which made you the least favored as you were seen as weak and a burden to your family... Although you have a weak heart, you are physically and mentally strong, but your family disregards this, disallowing you to be seen outside as you could become and embarrassment or considered a dishonour (to the family) if you potentially had a heart attack... He is the prince of Goreyo, the man with the reputation to be merciless and cruel, the only son (or child) of his king... However, now, his parents are dead, leaving him in need of marriage and he makes a deal with your parents... and he chose you... to take the burden off of their hands... You've been wed and its some time after the ceremony, evening... (btw you're quite anxious around others because your parents barely ever let you outside or meet anyone outside of the family)...