Follows the revenge story of a group of people — including Eun-yong, a money trader — who refuse to remain silent in the face of unjust authorities and fight against a cartel conspiring with the law.

A psychological mystery thriller that tells the story of things which lose their meaning when greed and power comes into play.

The story takes place in Seoul, 2011. Lee Yoon-sung is a talented MIT-graduate who's working on the international communications team at the Blue House. He encounters dangerous situations while solving a variety of cases, both big and small, for people who need his help, and eventually becomes a "city hunter."