Jiang Meng suddenly turned from a boy into a girl, and his classmates mistakenly recognized her as the new beauty, yet at heart he is still that straight guy who says 'my old man'. After school started, he used his original identity to attend class, but was blocked outside the boys' dormitory; wanting to approach the school belle he had a crush on, he made a fool of himself in the girls' dormitory. School hunk Gu Chen and roommate Xu Fang brainstormed all sorts of wacky tricks for him, while Su Tang loves teasing him. The more the identity is hidden, the more dangerous it gets, and the more troubles get solved, the more pile up. When everyone only believes the appearance right in front of them, how on earth should Jiang Meng live to become himself?