In Eun-Young's (Shin Eun-Kyung) life, family always comes first. Although her poor family situation forced her to work part-time since her school days, her romance with her first love, Jung-Woo (Kim Yu-Seok), made her the happiest woman in the world. Just as she was looking forward to a blissful future with Jung-Woo, he suddenly disappeared...
Five years later, Eun-Young reunites with Jung-Woo and discovers that he is already a married man. Meanwhile, she has married his intellectually disabled younger brother, Hyung-Woo (Kim Tae-Hwan)!