MC remembered her past life where she read a cliche romance novel.
In the novel ML married girl but she was weak she and their baby died in labor, MLs grandpa who was the duke also died, ml was devastated, lived his life gambling and drunk. But he met protag, though misunderstanding keeps getting in the way like ml thought she just likes his money and protag thinks he just likes her body and the worst was she saw the portrait of MLs previous wife who looks like her. But they became truthful and lived happily ever after.
MC then knew the previous wife was her little sis. So when ml went to their estate to propose to Emily(lil sis). Ofc MC did everything to not have Emily married off, which ml found amusing and Emily going Gaga as a romance fangirl. MC asked why should it be Emily, he said that viscount Langston was very noble, whereas they were poor noble but still didn't raise the taxes of their fief making them noblest of the nobles. So since MC didn't want Emily to be married off, ml just proposed to mc Infront of many, mc unable to reject accepted it.
Then MC had enlightenment, where she will just have the protag and ml meet so that ml will break their engagement.
For Better or For Worse