I Married His Lookalike

Jin Seorin was left at an orphanage as a child. She gave up going to university and spent the years after that supporting Choi Doseop, and the two of them kept a household together. Doseop qualified as a prosecutor. Seorin was carrying his child by then. Doseop took up with Min Nayoung, the only daughter of a chaebol family, and left Seorin. Seorin lost the pregnancy after that and made an attempt on her own life. Sung Guhyeon, heir to Sungil Group, found her and stopped it. Guhyeon has a rare condition that is taking his sight and his hearing by degrees. Seorin married him, and the marriage put her into the household where Doseop and Nayoung now live, as the woman running it.