To save my mother, I pleaded with my adopted sister to donate blood, but my brother accused me of being malicious and ended up killing me.

In my previous life, my mother suffered a massive hemorrhage after a car accident. I desperately pleaded with my brother to bring my adopted sister to the hospital for a blood transfusion to save her since they both had the rare blood type. But after the transfusion, my sister slipped away in the night and drowned herself in the sea. She left a note accusing our family of treating her like a human blood bank. My brother managed her funeral with an unsettling calm and assured me not to feel guilty. However, on my birthday, he forcibly took me to the hospital rooftop.