I'm Sorry Kang Nam-Goo (2016)

Jung Mo-A (Kim Min-Seo) marries Park Do-Hoon (Lee In). They both grew up at the same orphanage. Park Do-Hoon learns that he is the son from a wealthy family. He dumps Jung Mo-A and marries Cha Young-Hwa (Lee Na-Kyung). Her father is a powerful politician.