Manga name

Heey! I am looking for a manga I read the first chapter a while ago but forgot to bookmark it. It's a shoujo, the girl is invited by her uncle to go to the palace but she has to dress as a boy. The boy is the prince who goes into heat (so supernatural as well, not omegaverse tho.. I think) and bites her but since everyone thought she was a boy they just made her stay with him until the mark is gone (end of chapter one haha). If anyone has info it would be appreciated! Thanks!!