Seo Dong Jae is a prosecutor and works in the Cheongju District Prosecutors' Office. He is ambitious and places a priority on his success as a prosecutor. Nevertheless, he is not completely cold hearted as a person. Due to the label given to him as a corrupt prosecutor, his future as a prosecutor is not bright at all. While mired in trouble over a redevelopment case, he takes on a high school student murder case. He begins to walk a fine line between his intuition as a prosecutor and instinct as an opportunist.