While getting a nighttime snack, the illustrator Xin Xin runs into Yin Yin, a rich girl drunk and wasted on the street. Xin Xin takes her home, cleans her up, and even makes her a bowl of hot-and-sour noodle soup when she wakes up hungry... After some back-and-forth, Xin Xin ends up letting the "homeless" Yin Yin stay, as she needs a new roommate anyway. Bit by bit, the beautiful and outgoing Yin Yin chips away the icy facade of the serious and independent Xin Xin...