Lf

I'm looking for this romance manhwa where the main character was a illegitimate daughter of a noble where she and her mother works at. She has a half brother and sister. I'm not sure if her mother died but she made a deal with her biological father, since then she was trained to be a noble. She was then married off. Actually her sister was supposed to marry the ml but I think he had a bad reputation or something so when she saw him at the wedding, she regrets not marrying him