What is the manhwa I read?

I remembered reading this really good martial arts/harem manhwa with a female protagonist. She had black hair and she is in her second life after being killed before as a master of some other martial art. In this life she is becomes a concubine for the emperor/leader? Of another martial art sect. He’s takes a likening to her but not as the emperor. They meet in secret a lot and she doesn’t know that he’s the emperor. When they have to do the deed he just wraps her in a blanket like a burrito and wears a mask? ( not too sure about that one). There’s also this joke that he doesn’t have a D because she thinks he’s a Enoch. Also he has brown long hair.

I read it awhile ago so good luck but pls I need to read it!