Hong-Sil's (Han Ye-Seul) purpose in life is to save money. She doesn't go to church to avoid making donations, when she's sick she won't go to the hospital, and doesn't go on dates to save money. She'll even try to recycle one bottle or a sheet of paper for profit. She'll often think of various part-time jobs to make money and is in strong physical condition.
Even though Ji-Woong (Song Joong-Ki) graduated from college, he still asks his mother (who runs a restaurant) for money. He joins a scooter club to meet girls, but when he has the chance to spend a night with a woman - he can't because he is short by W50 (50 cents).