From Starry Heaven:

Rose is an ordinary girl who lives on the outskirts of the Kingdom of Vanalcand. But suddenly, she is swept away by the Earl Keith Aroad, a beautiful noble wrapped in a cloak. Rose wakes up in a big luxurious mansion and Keith tries to forcibly seduce her. Keith’s goal is to tie the knot with Rose, who has the blood of the royal family, and become king. In response to Rose’s resistance, Keith declares that he will make Rose want to be his. In order to hide Rose from others, who seek those of her bloodline, he decides to shelter her in his mansion. Rose, who hates just being protected, decides to disguise herself as a man and work as a butler...?!