Dong-Joo (Lee Dong-Gun, Lovers in Paris and Ruler of Your Own World) is about to find out. Abandoned at a young age, Dong-Joo grew up in an orphanage with his best friend Gi-Tae (Kim Sung-Su, Lawyers and Full House). After the arrival of Ji-Soo (Kim Ha-Neul, Romance, Happy Together and Secret), the two friends become rivals, competing for her affection. An accident, however, soon separates the friends. Adopted by a wealthy Japanese couple, Dong-Joo leaves Korea behind.

Twelve years later, Dong-Joo returns to Korea, only to find Gi-Tae and Ji-Soo are now together. Though Dong-Joo greatly values his friendship with Gi-Tae, his love for Ji-Soo is as strong as ever. Can Dong-Joo win back Ji-Soo's heart without destroying his bond with Gi-Tae?