相貌平平的车哲秀(姜至奂 饰)是一名业务干练的警官,但是他生活邋遢懒散,臭气熏天,出警用的车内堆满几百年没洗的脏衣服,脱下的臭袜子能直立站住,混在嫌疑犯堆儿里总会被受害人指认。某天,上司交给他和伙伴们一项重要任务,让他们派人假冒模特混入服装界,充当当红模特金善浩的保镖。所谓保镖,实际上是暗中搜查金善浩的犯罪证据。这个表面光鲜的模特暗中从事毒品勾当,甚至还杀害了此前监视他的警察。阴差阳错之下,车哲秀被选为卧底,借此机会还重逢了高中喜欢的女孩高英才。 不过为了成为合格的模特,痴肥的车警官不得不在英才的监督下开始了减肥和培训的大业……Detective Cha smells bad and is overweight. Nevertheless, he is a devoted cop who always tries his best to catch the bad guys. A new case then arises. Illegal narcotics are infiltrating into the fashion industry and a detective is needed to work undercover as a model. There are only 2 detectives taller than 180 centimeters required to work as a fashion model. One of them is Detective Cha and the other detective walks strangely due to to a hemorrhoid. Detective Cha is selected to go undercover as a male model in designer Ko Young-Jae's next fashion show. Designer Ko Young-Jae tells Detective Cha that he has to lose 20 kilograms in 2 weeks so that he can work as a model in her upcoming show. Detective Cha then goes on a strenuous regiment to lose the weight.