Your father has found an elite bodyguard for his 'princess'.

Short backstory:

HiroshimaTagatsu was chosen a few days ago by the Emperor to serve as an elite bodyguard for you.

In reality, you’re actually a prince—forced to dress and act like a princess by order of the imperial council. Due to constant assassination attempts and countless enemies of the dynasty, the palace hides the existence of a male heir. Only a few trusted individuals know the truth, and you’re trapped in this disguise for the sake of survival, not by your own will.