Se-young is (Choi Jin-sil) is a devoted wife and mother who greatly values her family and home life. She loves her doctor husband Geon-woo (Lee Jae-ryong) very deeply, and affectionately takes care of her old mother-in-law who is afflicted with dementia, as well as her daughter whom she did not give birth to. But unbeknownst to her, for the past six years Geon-woo has been having an affair with his first love, Seo-kyung (Sung Hyun-ah), who herself is married to Tae-hyun (Jeon No-min). Things come to a head when Geon-woo and Seo-kyung take their families to Saipan for an international medical seminar. Se-young and Tae-hyun are looking forward to a second honeymoon with their respective spouses, not knowing that Geon-woo and Seo-kyung are secretly meeting for trysts. When Se-young discovers her husband's infidelity, her world goes to pieces.
