A naked man paints himself.

Oh Tae Shik, rather, Oh Kyeon Shik, who has been preparing to become a detective while working a different job, is a private establishment security guard who earns 880,000 won in Daechi Dong, Gangnam. Thanks to his dream of becoming a detective, he is like a bulldozer who does not know how to give up. He always watched CSI and Detective Columbo's movies, analyzing their traits and building his dream of becoming a great detective. He manages to pass the written test, but he doesn't meet the hearing baseline and fails. Then one day, coincidence happens and a fugitive on the run gets caught by Kyeon Shik when he throws a bottle of water he just bought at the runner. Kyeon Shik becomes a hero thanks to this.

Ohyaku is a grifter who falls in love with a thief, who recruits her for his plan to rob a shipment of government gold. When this plan goes wrong and Ohyaku ends up in prison, she resolves to do anything to escape and claim revenge on the ones who betrayed her and her lover.