Tyram

Can someone help me find it again? A manhwa about a twin sister of a tyrant wich had blue eyes, meaning she had the power the family wanted, so they abused her and isolated her. Her twin brother had an obsession with her. They had dark blue hair. Then the older brother sent several slave to her chamber and she was know to use them, but actually they all end up dead before arriving to her. One day a slave wich was a prince, came but he survived and they slept together a lot. Then he understand it was an experiment from the priest or something, and the princess already knew.
The brother always asked the twin sister to wear light clothes so she was cold. And also it was in another era fantaisy because I’m reading what I wrote and it sounds very weird in our generation

Can someone help me out please? Okay so now I’m looking for a manhwa where the guy was very big compared to the girl, there was smut, the guy was a construction worker ( I think) and he liked to put a costume on the girl, it’s a height difference thing and also I think the girl had pink hair.