Spin-off of the thriller series Stranger, and will revolve around one of its characters – Seo Dongjae, whose future is bleak due to the stigma of his past corruption as a sponsor prosecutor. Seo Dong Jae is a prosecutor at the Cheongju District Prosecutors’ Office who has a bleak future due to the stigma of having been corrupted in the past. As he takes on the murder case of a high school girl, he begins to walk a dangerous tightrope between his instincts as a prosecutor and as an opportunist.