Underground rapper Hak Soo has challenged TV audition program for 6 years but never gets into the finalist. On the day that he fails his 7th audition, he receives a call from his hometown that his father is in the hospital. He rushes his hometown Byun San, where he has left since high school only to find it is his father's plot to bring him to Byun San. He immediately heads back to Seoul, but he is suspected as a phishing scam criminal there, and somehow bound in Byun San, the small, boring suburb.
Chun Jae In (Kang Ji Hwan) is an elite detective with a genius IQ, who guided by only facts, logic, and numbers. Meanwhile, Kim Dan (Kim Ok Bin) is a rookie detective who can see ghosts. They work together to uncover a conspiracy involving a powerful organization.
A 40-year-old taxi driver is found dead at Yakcheon. Hyun Woo, who was a witness, is charged with murder despite his cry for innocence and serves 10 years in prison. After being released from prison, Hyun Woo tries to lead a quiet life with his mother, but the stigma of being a convicted murderer is hard to rid of. Meanwhile, lawyer Joon Yeong just lost a huge class-action suit. Heavily in debt, he decides to find a job at a law firm. While offering pro bono services arranged by the firm, Joon Yeong meets Hyun Woo, and they begin their journey to prove Hyun Woo's innocence.