Joon-suh and Eun-suh are raised as brother and sister for 14 years until it is discovered that Eun-suh was switched with Joon-suh's real sister (Shin-ae) at birth. Upon learning of the mixup, Joon-suh's family leaves for the States, leaving Eun-suh in Korea. After 9 years, Joon-suh's family returns to Korea. Joon-suh and Eun-suh are eventually reunited, but only after Joon-suh becomes engaged to Yumi and Tae-suhk falls for Eun-suh. Trouble starts when Joon-suh and Eun-suh cannot avoid their true love for each other.