Joon-sang moves to a rural city in South Korea. On one day, Joon-sang soon falls in love with Yu-jin. Their love is cut short when Joon-sang loses his memory after a serious auto-accident. Joon-sang's mother has Joon-sang brainwashed so he will not remember his painful memories. As a result, Joon-sang's memories prior to the accident are erased. Joon-sang's mother decides to move to the United States with Joon-sang. Both his friends and teachers are told that Joon-sang is dead.

Ten years later, Joon-sang returns to Korea and Yu-jin sees him on the street, prompting her to put off her engagement to childhood friend Sang-hyuk. Little does she know that Joon-sang is dating her friend and sometime rival Chelin. The story's plot intensifies when Yu-jin begins work at the firm where Joon-sang is employed, and tries to find out if he is her lost lover Joon-sang.

Adaptation of the popular 2002 Korean live action romantic drama Winter Sonata (Gyeoul Yeonga)