Perhaps because Marrisa was often looked down upon due to her poor background, she was eager to show off that she was living a good life now since her circumstances had improved dramatically.
She completely changed her style of dressing, and whenever she picked Morris up from school, she would always brag about Morris being friends with Jacqueline and how Jacqueline admired his piano-playing skills. She also claimed that Morris was destined to become a great pianist in the future.
At first, pe