The 10th prince eun make friend with heeseo but hee seo is still on her mission of finding who the 4th Prince so is.
It now the festival day all the prince dress up with a mask except for the crown prince moo, He dress up in another atire but with a mask and he have to battle with other town but he knew he can't fight so he exchange his clothes with the 4th prince so to fight as crown prince.
The other part hated goskil so they wants to kill the crown prince but the crown prince is not really In his clothes . All their target went to the 4th Prince so.
the other town sent ninjas but the 4th Prince so was able to stop them and he also tried to trail one of the ninjas to find out where and who sent them. He finally followed one of them so hee seo spotted the 4th Prince so chasing someone and she decided to follow him but she passes the wrong way to where a really weird man is cutting some people tongue. she can't stand it so she screamed, the man tried to chase her but the 4th Prince so saved her.
Hee seo tried to trail the 4th Prince so again and he said "Ain't you afraid of me" but she (scoff) "why would I be afraid of you am afraid of myself more than anyone". The king called the 4th Prince and thanking him for saving everyone and that he should take a bath that they would go out together. (the 4th prince has a half mask on his face because this mother hate him so much that she use a knife to cut his face and now it turns to a very big scar but he use the mask to cover his face even all of prince haven't seen his face) hee seo was still spying on him and she entered his tub. the 4th Prince so off this clothes and remove his mask