Shin, a serial murderer, has shaken the entire nation of South Korea to its core. Jihu Seo, who lost his father to Shin's evil deeds, meets another victim: Duseok Kim, a former detective who also had his family murdered by Shin. Duseok vows to turn Jihu into a human weapon to exact revenge on Shin—in prison, with his bare hands. "Korea has not implemented the death penalty since 1997. With no one else upholding justice, what other choice is there?"