Hyun-woo (Ji Sung) is the reluctant heir to his father's chemical company and engaged to be married to Soo-jin (Lee Bo-young). Eun-soo (Eugene) lives a simple life, running a bed and breakfast with her elderly father. Their paths cross one fateful night when, after a failed attempt on his life, Hyun-woo loses his memory in a car accident. Discovered on the roadside by Eun-soo and her father, they take him in, nursing him back to health. Over the course of his recovery, Eun-soo and Hyun-woo (whom she has named "Baek Chang-ho") fall in love.
On the day of their engagement, Eun-soo's father passes away. Following another attempt on Hyun-woo's life and a resulting accident, Hyun-woo regains his memory but forgets the year he spent with Eun-soo and leaves her to seek out his past life.
Eun-soo, in her determination to find her lost love, travels to the city where she meets Hyun-woo, who, in turn, gradually falls in love with her again. A close confidant of Hyun-woo, Tae-min, is revealed as a traitor seeking to gain control of Hyun-woo's company. Tae-min is ultimately exposed and Hyun-woo regains ownership of the company.
In a final, desperate attempt to get revenge on Hyun-woo, Tae-min tries to run him over, but instead of Hyun-woo, Eun-soo shows up and this accident paralyzes her from waist down. Refusing to be a burden to Hyun-woo, Eun-soo disappears to work as a teacher at a home for physically challenged children, until after a year of searching, Hyun-woo sees a familiar drawing, and the lovers reunite. The final credits show Eun-soo learning to walk again with Hyun-woo's assistance.