Detective Cha is an over-zealous detective who will stop at nothing to nab a suspect. He is so singularly devoted to his career that he can't even spare a moment to shower or change his clothes. With such passion, it's no surprise that he is assigned to undercover duty for one of the city's biggest criminal cases. As a runway model. Now Chul Soo is doubly burdened: he must of course catch his crook, but in order to do so, he is going to have to lose 20 kilograms and undergo an absolutely radical makeover at the hands of fashion designer Young Jae, an old high school friend of his.