The Ugly Bride Brought in to Bring Good Luck, Cherished by Her Yandere Husband

How could an SSS-rank assassin transmigrate into the body of an ugly bride who’s supposed to take her stepsister’s place and marry a sickly man?! Don’t panic! With the System at my side, the world is mine! What?! The System’s very first task is to beat the daylights out of my rotten stepfather! Just what I had in mind! Yan Yu’er immediately gave him a thorough beating, forcing her stepfather and mother to divorce and winning back her freedom. She took her mother with her to marry the sickly husband, expecting to spend her married life as a widow in all but name. But then her sickly husband suddenly opened his eyes. “Wife.” Yan Yu’er: No! I just want to live as a widow in peace!