Kingdom of Bangtan Sonyeondan_Taejin

Kim Taehyung, a prince charming to every girl. He always seem to be happy, at least that it was they thought. He said he shall wait for his princess to come, Kim Seokjin. He always wonder why she has a guy's name but soon forgot about that. But in reality she was a he. Unfortunately, for him he was mistaken as a girl by his parents when he was born. After the engagement they set with Kim Taehyung, they finally had realise their beautiful daughter was a beautiful son.After a few years later, they were attack out of no where. Kim Seokjin, was the only one who survived and escaped to safeness. After that he grew up alone with a boy, Jeon Jungkook. After another few years, one day he was told to go the castle immediately. What happens when he figures out he was engaged to Kim Taehyung?