Read The 99th Bride of the Duke manga – The 99th Bride of the Duke manhwa
Summary: Grace, who lost her mother and became an orphan, was living on the street waiting for her death, was saved by Penelope Erdona and she became Grace Erdona. One day, while she and Penelope were together, Penelope talked about getting married. The person she must marry is none other than the Duke of Felton, the most powerful family in the world. There was a rumor that all the women who got married there had disappeared or returned with a very strange mental state.