Taehyung is a prince, one day you were walking through a forest and you got lost, you kept walking through the forest, until you came across a black castle...They said if you went any deeper into the forest you would reach the kingdom of the moon, you see a a prince all in black, until the crown was black...

Taehyung: I said I’m not going to marry any of the people! He says as he comes from outside the castle

Butler: Right now your father withdraws from the throne and you are the heir!