Jang Woo (So Ji Sub) would do anything for his childhood sweetheart Soo Yeon (Kim Ha Neul), including go to war. When Soo Yeon's family falls on hard times, he joins the army in order to earn money to pay for Soo Yeon's tuition. Soo Yeon studies hard, patiently awaiting Jang Woo's return, but instead she receives news of his death. Fate brings another man into her life: Tae Ho, who graduated from the army academy at the top of his class. Though she can't forget Jang Woo, Soo Yeon eventually agrees to marry Tae Ho. On the eve of their wedding, Jang Woo suddenly appears again, revealing that the death notice had been a mistake. The next morning - June 25, 1950 - the North Korean army invades South Korea, marking the start of the Korean War. With their lives and love already in turmoil, both Jang Woo and Tae Ho are sent north to the battlefield.