Hooked on My Obsessive Sister

Liora, a broke fast-food worker, dies and wakes as a novel's wicked stepsister. Ordered by a system to push sweet Maren's corruption to 100% for $100 million and home, she bullies her on the surface but secretly cares for her. Unaware Maren is a yandere who hacked the system and heard her every thought, she chooses love and stays.