Determined to seek justice, Kim embarks on a relentless pursuit to track down the elusive killer. However, instead of capturing Kyung-chul, Kim decides to exact his own form of punishment. He methodically and ruthlessly infiltrates Kyung-chul's life, turning the tables and subjecting him to a never-ending cycle of torment and terror.
As the line between hunter and prey blurs, Kim finds himself descending into a moral abyss. Consumed by his desire for vengeance, he becomes just as monstrous as the man he seeks to destroy. The film delves into the complex psychological dynamics between the two characters, exploring the price of vengeance and the devastating consequences it has on the human psyche.
"I Saw the Devil" is a gritty and intense cinematic experience that pushes the boundaries of morality and tests the limits of one's capacity for revenge. With its relentless pacing, visceral violence, and thought-provoking themes, the film offers a chilling exploration of the darkness that resides within us all.