Wei Li, Da Pang, and Ya Ya are three university students sharing an apartment together. One day, they find an envelope full of money sitting on the floor of their apartment. As they all need money, they take some of their own, thinking it is one of the others' money and that they can return it later. Suddenly, Kaka, their friend and landlord's granddaughter, appears after spending a year abroad with a mysterious baby in tow looking for the envelope and reveals that the envelope of money was for the baby's babysitting fee. Because the boys had already spent the money, they are forced to take up the job of caring for the baby instead.
