Cruel Killer (2003)

Growing up in the countryside with his mother, Tang Jia Cong always felt abandoned by his father, who lived in Hong Kong with another family. After his mother's death, Jia Cong finally travels to Hong Kong to reunite with his father. However, his arrival is unwelcome, adding to the family's burdens. Unable to find work and struggling to adjust, Jia Cong finds himself overwhelmed and isolated on Christmas Eve. A confrontation with his father's wife escalates, leading to a horrifying act: Jia Cong accidentally kills her and his father. He spends the night concealing the bodies, but his plans are disrupted by the unexpected return of his sister, forcing him to commit another murder to silence her.