After I Died, My Mother Heard My Sister's Voice

I was born as a backup blood bag for my sister. My sister is my parents' beloved daughter, she can be coquettish, cheating, and disobedient. And I was just an eyesore, a silent "human blood storage tank", and was ignored by them as a matter of course. In order to marry her boyfriend, my sister repeatedly threatened her parents to commit suicide by cutting her wrists. While my parents were angry at me, my blood was drawn until I became weak and in a daze. However, at the moment of the car accident, I subconsciously protected my mother - and then I was violently pushed away after the car accident, and I watched her shouting "good baby" and pounce on my sister. At the last moment when I closed my eyes, I finally had no more extravagant desires for family love. But I didn't expect that after my death, my mother would actually start to hear my sister's voice...