Director Lee Won-tae had a specific goal. He wasn't making a documentary about Yoo Young-chul; he was making a genre film about the blurry line between law and crime. The true story provided a fantastic hook —a gangster hunting a killer—but it lacked narrative symmetry.
While the specific alliance between a mobster and a cop is a dramatized "what if" scenario, the director, Lee Won-tae, has stated that the film is from various criminal cases in South Korea. 1. The "Devil" and Real-Life Serial Killers is the gangster the cop the devil based on true story
The core inciting event—the killer stabbing a gangster who subsequently survives—is the primary "true" element the filmmakers utilized to launch the plot. Director Lee Won-tae had a specific goal
The character "K" is widely believed to be inspired by Yoo Young-chul , known as the "Raincoat Killer." Yoo murdered at least 20 people between 2003 and 2004. According to discussions on Reddit , the killer's habit of staging car accidents to lure victims mirrors real criminal tactics from that era. While the specific alliance between a mobster and