A thief mistakenly breaks into the bedroom of the beauty Cheng Xinyu to steal money and a phone. Upon seeing the sexy woman's beautiful legs, he develops evil intentions once again, but unexpectedly gets knocked unconscious by Cheng Xinyu! Zhou Junyi, the roommate living right next door, hears the commotion and comes over to help catch the thief, but is mistaken by Cheng Xinyu for an accomplice of the thief and almost gets "severely beaten" by her. Sharing an apartment, one is a talented yet down-on-his-luck "poor loser", while the other is a rebellious teenage girl working at a KTV, and the two embark on a comical "cohabitation" life.