Lee Seo-hwan

A retired contract killer goes on a bloody rampage when a young girl finds herself at the mercy of gangland human traffickers and only one man can come to her rescue, with an arsenal of weapons and years of experience in the art of killing.

After barely surviving a brutal attack by a sadistic serial killer, crime boss Jang Dong-su is left humiliated. Determined to catch the killer known as K, he forms an uneasy alliance with Jung Tae-seok, a relentless and incorruptible detective who often disrupts his illegal business. However, while Jang Dong-su wants K dead, Jung Tae-suk is determined to bring him to justice. With a deal in place—whoever finds K first will decide his fate—the hunt begins, blurring the lines between crime and law.

An old man is found dead, and his housekeeper is charged with the murder. Her defense attorney is surprised to learn the only witness to the crime is a teenage girl with autism.