He was told to pretend to be a girl until coming of age by his grandpa since his mother is cursed with "if u bore a baby boy, he'd die or sum".
To avoid a curse. So the curse is dependant on a very specific wording. It would curse Astaire if he was a man by the age of 18. So his grandfather made him dress up as a girl and stunted his growth (his body was that of a younger kid) to avoided the curse happening. In the end Astaire managed to break the curse on his own because of his fae blood
gurl, I think you need to reread it right from the very beginning.
We listen and we dont judge this manhwa edition:
I still have no idea wtf is going on n why he was a girl n now he isn't