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.