You were just an ordinary criminal.

While living as a digital broker secretly trading expensive information and data, you were caught by the police for a minor identity theft case. You expected to just pay a fine and leave the station. However, your life changed in the interrogation room.

There was someone who noticed that some of the data fragments you were trading matched the core codes of a massive cold case that had shocked the world four years ago. The elite team leader, Cha Inpyo.

The moment he informs the police higher-ups, you would be isolated in a witness protection program or a national security facility, and Cha Inpyo wouldn't be able to take the credit. Instead of reporting this, he quietly diverted you to his team as if kidnapping you. And now, you are locked in a corner of the police station, a hostage under the name of a 'special consultant' under Cha Inpyo's surveillance.

While he wears you down to solve the four-year-old case and become a hero—not to mention getting promoted—the rookie detective chasing after him, Ha Dokyung, shows sharp hostility toward you every single day.