Lim Da-young, an older sister who intercepted her younger brother’s lover. Because of that, he confines his younger brother Da-jung Lim in a mental hospital and leads a happy marriage…

Yeon-woo is reunited with her first love, Yoon-jeong, at a reunion after returning from America. While her husband is on a business trip, Yoon Jeong-eun calls Yeon-woo to her house…