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.

Intern Detective

The third prison of death, where only vicious criminals who do not have a sense of law or common sense are being kept. A new era of power opens when Lee Tae-sik, the nation's former boss entered the office. Soon, the new warden, Jo Pyeong-ho, ends the evil without blood or tears, and begins to imprison the prisoners terribly, including Lee Tae-sik.

Asurado

Depicts the rebellion that takes place when villains with different desires enter the Jungae Prison, where female inmates gather.