The Killer

Retired assassin Bang Ui-gang's life is turned upside down when he's tasked with watching his friend's 17-year-old daughter while her mother is away on a trip. But after a street attack, Ui-gang finds himself embroiled in a murder investigation and a dark world of human trafficking, all while being forced to confront the traumatic events of his past. With his skills as a killer put to the ultimate test, Ui-gang must use every ounce of strength and cunning to protect Yoon-ji and uncover the truth behind her kidnapping.