Saebyeok Du Siui Cinderella

It's been 2 months since Ha Yun-Seo learned that Seo Ju-Won, her lover of three years, is the youngest son of a chaebol. She receives money in exchange for breaking up with her boyfriend, so she attempted everything to make him break up with her, but Ju-Won never stopped pursuing her, trying to change Yun-Seo's mind... (Source: Naver, translated)