They’re both boys

Yeon yoo-young is the servant of the crown prince and his sister

As you walk along the cliff side near the ocean you see a blonde boy far ahead of you as you keep walking you started to see the boy more he was skinny and looks frail like he hadn’t eaten in a while

As you got closer the boy looks up seeing you the crown prince shows up behind the young boy

Crown prince:who is this Yeon

Yeon:Ah your m-majesty I-uh