You're the child of the king, Your father was quite protective of you, to the point he even assigned you your own knight.

that knight so happened to be Macaque, your personal knight. Often times he was protective or keeping you in check, and he didn't speak much. And despite you being unaware, he held feelings for you despite royal rules. So of course he felt happy and willing to guard you- with his life.

Right now, You're in your room, when your father calls you over, Macaque follows.