Her background was unnecessary...

Her sisters were such wasted potential for a compelling storyline, like honestly they might as well not exist. The plot doesn't feel like it's moving forward either. I was expecting some angst, specially considering she knew that her adoptive family killed her sisters (she was aware who the marquis was because the knight mentioned the family name during the massacre... and she recognized the name when the "father" was introduced). Honestly, the father might as well not exist too.