I, the Executioner

“Don't cross the line.”

Seo Do-cheol (Hwang Jung-min) is a veteran detective who has never let a suspect walk, and he runs his Major Crimes team on that stubbornness. A serial killer has the whole country on edge, so Seo takes on a rookie, Park Sun-woo (Jung Hae-in), and starts the chase. Ryoo Seung-wan, returning to the world of Veteran, makes the hunt a test of what a cop owes the law and what he owes the people it fails.