The Last Sentence I Love You

One is a gifted and smart sister, and the other is a simple and kind-hearted sister. The older sister has everything perfect, while the younger sister can only be an accessory around her. Desire makes the older sister lose herself and embark on a road of no return. What can the kind-hearted younger sister use to wake up the addicted older sister? Friendship? Love? "It would be great if I wasn't your sister, so I wouldn't be in such a dilemma!" "If there is a next life, I hope I can still be your sister."