Tragedy, twists, revenge, tearjerker, beautiful tragedy, son preference, dysfunctional family, siblings, adoption, organ donation, face-slapping, feel-good story, subverting expectations, short story, complete, Zhihu-style. I was not the Lin couple’s biological child. The real reason they adopted me was to provide their only son, Lin Hao, with a mobile life-support system. Over twenty years, I went through hundreds of blood transfusions and bone marrow transplants, and even took a knife wound meant for him. Then my attending physician made it clear: another kidney donation would put my life in danger. My adoptive parents only said, “Hao’er is still young. He can’t die.” I signed the organ donation agreement with a smile, naming myself as the beneficiary. On the day of my funeral, my younger brother posted on his social media feed: “At last, no one will compete with me for the family fortune.” He had no idea that my final act before I died was to send him the paternity test results. Lin Nian, an adopted “mobile blood bank,” spent twenty-three years living for others, then chose to die once for herself. Her younger brother, a spoiled ingrate who enjoyed the comfortable life his sister bought with her own life, didn’t know the truth until he received that paternity test.