A crime-thriller drama about the relentless pursuit of a Prosecutor toward the man who murdered his first love, while the statute of limitations is getting closer. Cha Woo Jin is a prosecutor. Fifteen years ago, he lost his first love Seung Hee to a crime. Since then, he has devoted himself to violent crime cases. While he looks for a criminal, a female high school student Jo Eun Bi becomes involved in the case. Section Chief Han and a prosecution investigation officer work with Cha Woo Jin.