Cha Joo-Hyuk (Ji Sung) has been married to Seo Woo-Jin (Han Ji-Min) for 5 years. Cha Joo-Hyuk works at a bank and Seo Woo-Jin also has a working career. Due to an unexpected case, Cha Joo-Hyuk makes a choice and that choice leads people, including himself and Seo Woo-Jin, to have totally different lives in the present day.