Monster

In a small town, a young woman named Bok-soon lives a simple life running a street stall with her younger sister Eun-jeong, who she loves dearly. However, their peaceful existence is shattered when a cold-blooded serial killer named Tae-soo murders Eun-jeong, thinking she may have discovered his dark secret. Consumed by grief, rage, and madness, Bok-soon sets out on a path of revenge against Tae-soo, teaming up with Na-ri, a young girl who is also being hunted by the killer. As the two women face off against the ruthless murderer, they uncover the truth behind his monstrous acts and the twisted family dynamics that fueled his madness. Will they be able to bring him to justice, or will they fall victim to his brutal ways?

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Some movies that have similar genres and were produced around the same time as Monster include Parasite, The Town, Brothers, Den of Thieves, The Killing of a Sacred Deer, The Accountant.