Jung Da-jung (Kim Ha-neul) and Hong Dae-young (Yoon Sang-hyun) are married and have a set of fraternal twins, Hong Shi-ah (Roh Jeong-eui) and Hong Shi-woo (Ryeoun). At first, they have a perfectly happy marriage despite having children at a very young age and having financial problems. Years later, their happy marriage starts crumbling when 37-year-old Da-jung files for divorce and their 18-year-old good looking twins start ignoring Dae-young, except for pocket money. Furthermore, Dae-young's life turns more miserable when he loses his job, after his boss promotes his nephew who has worked in the company for only 4 years, while relocating Dae-young to Busan.