Two people, linked by a grave mistake from the past, seem destined to cross paths. One, Min Ki Seo, is a surgical resident, struggling to cope with his girlfriend's illness. The other, Lee Young Shin, is a single mother doing everything she can to support her young daughter and ailing grandfather

Young Shin contemplates getting married solely for the sake of her child. After losing his girlfriend and his job, Ki Seo wonders if he should give up medicine altogether

Ki Seo becomes a local hero after saving a man's life. Despite his harsh manners, Young Shin takes him in when he doesn't have anywhere else to go

Young Shin's grandfather runs off yet again. Plus Seok Hyun, feeling a responsibility toward Young Shin and Bom, makes a deal to protect them.

To Bom's delight, Ki Seo decides to board at their house for longer than originally planned. Plus, Ki Seo and Seok Hyun get into some serious trouble with business.

Out of her commitment to Bom and Mr. Lee, Young Shin reluctantly goes out on a blind date. Meanwhile, Ki Seo is forced to grapple with some difficult decisions in his work.