After a breakup, Lin Bei gets drunk and slaps his buddy on the shoulder, declaring that if he ever turns into a girl, he'll treat them all to a year of barbecue. When he wakes up, he's actually become the prettiest girl on campus. To prove he's still a real man, he has to expose his embarrassing secrets: the extra-small tank top hidden in his wardrobe and the heart-shaped birthmark near his upper thigh. From then on, Lin Bei and his three buddies live through one chaotic adventure after another, dodging dorm supervisors, trying on new clothes, sneaking into the girls' dorm as an undercover spy, and even fending off admirers on his friends' behalf. Behind all the hilarious chaos, the four young men discover for the first time that no matter what they look like, brothers will always be brothers.