re do style revenge but more brutal both mentally and physically and emotionally and the little sister can be used as she is talent use her while torturing her and in the end use her as n ingredients for some elixir
well just like in the transmigrator vera chapter how you tried to add her as a transmigrator you could include a transmigrator and also a regressor as it could make the novel plot intresting
well author I hope her little sister is also in this world as mc and is real not a fabricated memory
well I hope you got the reference about memory part