I'm Sorry, I Love You - 1x02 - Season 1, Episode 2- Followmy.tv

Cha Moo Hyuk doesn't know how long he has to life. He returns to Korea to look for his birth mom. He discovers he has a twin sister who has a mental disability. His nephew provides for his mom and himself. Song Eun Chae has returned to Korea with Choi Yune. Unaware of her feelings Yune keeps enlisting Eun Chae to help him capture Kang Min Joo's heart. Cha Moo Hyuk discovers more about his birth parents. Coincidentally Moo Hyuk's and Eun Chae's paths cross again.