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During their carefree youth, Sang-hee (played by Park Yong-ha) and Yoo-jin (played by Choi Ji-woo) were a couple in their class, often spending time together. Their classmates and teachers all knew about their relationship, but no one said anything. However, their sweet campus romance was about to change due to one person. On that day, the handsome young man Jun-sang (played by Bae Yong-joon) transferred to Sang-hee and Yoo-jin's class. Perhaps it was love at first sight, as after meeting Jun-sang, Yoo-jin became convinced that he was her true first love. She threw herself into their relationship without hesitation, and the two quickly became deeply in love. However, on the eve of Christmas, Jun-sang's mother, in order to prevent him from meeting his biological father, decided to send him to the United States. Before leaving, Jun-sang rushed to meet Yoo-jin but unfortunately got into a car accident. Shortly after, his mother announced his death, which left Yoo-jin heartbroken and helpless. Ten years passed in the blink of an eye, and the young people from that time had all grown up. Jun-sang's mother, along with her husband whom she met in the United States, returned to Korea, bringing their son Min-hyeong with them. At a party, Yoo-jin met Min-hyeong and discovered that he was the Jun-sang who was supposedly dead! However, Min-hyeong had no memory of Yoo-jin at all...