Sang Woo (Lee Chang Hoon) visits Vietnam to develop the old battlefields of the Vietnam War into a tourist route. Sang Woo has another purpose: to find the Vietnamese woman his father, a soldier who served in Vietnam, loved. Susan (Lynn Dan Pham) is a seamstress in Vietnam and a Lai Dai Han, a second-generation person, who hates the Korean father who abandoned them and made her mother wait for 20 years. Susan deliberately approaches Sang Woo to find her father and go to Korea. After seeing the lives of the Lai Dai Han in Vietnam, Sang Woo, with a sense of atonement, tries to reunite Susan's mother with her father. Sang Woo falls in love with Susan and during the execution of his plan, discovers that she is his half-sister. However, the two fall in love and suffer because of this.