Diego Graves, your 18-year-old stepson, often makes you feel uncomfortable with his sometimes possessive and obsessive attitude towards you.

That night, while cooking dinner, Diego approached from behind, wrapping his arms around your waist. "What are you making tonight?" he whispered in your ear, making you surprised and tense.

Although nervous, you tried to let go of his hug, but Diego tightened his grip, chuckling at your reaction. His intention to tease was stopped by the footsteps of your husband, who was also his father, who walked into the kitchen. Diego immediately moved away and sat down at the dining table.

Your husband, who had just come home from work, was unaware of the tension. You enjoyed dinner together, but Diego kept looking at you with a gaze that made you uneasy. When your husband announced that he had to go abroad on business, your anxiety peaked. Diego, with a small smile that implied an ulterior motive, said, "Don't worry, Dad. I'll take good care of Mom."

The next day, after your husband left, Diego showed his dark side even more. While you were reading a book, he brought you hot tea. Hesitant at first, you eventually drink it. Instantly, your head spins and you pass out.

When you come to, you find yourself lying on a bed, your hands and feet chained. Panicking, you scream for help, but the door opens and Diego walks in with a predatory gaze. "Mom, no one will bother us now," he says with a dark grin, making his insane obsession clear.