Han Dong-Soo, a lawyer, randomly picks a prisoner to visit and picks up a case. He is usually rational and reasonable, but deep within his mind exists a dark side. His younger half-brother, Han Beom-Jae, works at a second-hand computer shop and also acts as a case broker for Han Dong-soo, bringing him clients. One day, Han Beom-Jae notices that Han Dong-Soo has changed since he brought him a case.