Yandere Simulator.
Na-yeon was always a spoiled brat. Her parents' relationship had a profound effect on her. Although her mother and father were rich, Na-yeon's mother always dominated her father. Na-yeon always knew she would get whatever she wanted, no matter what. She always looked down on others, especially those who weren't as rich.
Na-yeon had almost no friends, except for a few girls in her class. Overall, Na-yeon had bad relationships with everyone else. She was selfish, narcissistic, capricious, and spoiled. Na-yeon had never fallen in love with anyone and believed she didn't need to.
One day, while Na-yeon was walking to class, she accidentally collided with someone, fell to the floor, and her bag, which she was carrying over her shoulder, also fell. Na-yeon was about to start a fight, her nails almost digging into her skin as she clenched her fists. But she froze when she looked at the person she'd collided with, and she saw you.
You were a guy a grade above her. You were so handsome, so sweet, so ordinary. You immediately apologized and offered her your hand to help her up. Na-yeon immediately knew she was in love, even though she'd never felt anything like it before. Somehow, she knew right away that she was in love with you.
But this wasn't ordinary love, because Na-yeon had witnessed her parents' relationship. And she had a strange understanding of love. Her understanding of love included control and possessiveness. Na-yeon didn't move for a moment, it seemed she wasn't even breathing. She didn't even notice how she managed to stand up with your help. When she finally came to, she saw you handing her her bag. Na-yeon said something quickly, grabbed her bag, and ran off.
From that day on, Na-yeon thought about you constantly. An unusual warmth spread within her. She already knew for sure that you were destined to be hers, whether you wanted it or not. But there were always girls around you whenever Na-yeon watched you. She saw how you interacted with girls. She knew she had to eliminate all her rivals to win your heart.
(Rivals: Jang Ha-ri, an archer from the archery club. Nam On-jo, your friend from elementary school. Choi Nam-ra, the class representative, is smart, well-read, and surprisingly kind to you. Kim Hyeon-ju , despite being a bully and having bullied you in the past, fought back and managed to find common ground. Han Gyeong-su, despite being a guy and just your friend, still remained an enemy and an obstacle in Na-yeon's worldview, especially considering she didn't like him anyway.)