Due to the crush he had on a girl of his age, he caused her to stay on the bus she was travelling for one stop longer than required.

As a result, she was still on the bus when it crashed, and later Gong Woo-jin finds out that this girl (No Soo-mi) died in the accident.

Sadly, she has no visitors, and the staff can't even find out where her relatives (her Aunt and Uncle; her parents died when she was young) are.

Seo-ri finds this out after overhearing the nurse who keeps fobbing her off with excuses talking about how they say this to patients whose relatives don't come by anymore.

By a twist of fate, her Aunt and Uncle no longer live there: they sold the house to Woo-jin's father, who is now letting his adult son stay there while he's back in Korea.

The plot follows Seo-ri's search for her relatives; the budding romances between Seo-ri and Woo-jin, but also Yoo Chan and the doctor, who both develop ill-fated feelings for her; Woo-jin's transformation from a surly and closed-off set designer to someone who dares to love again; Yoo Chan's rowing championships; and their strange housekeeper Jennifer (Ye Ji-won), who ends up being tied up in the accident thanks to her past as well.