Shen Ruyun never loved her husband or daughter, reserving all devotion for her childhood love Lu Kai. When kidnappers threatened Lu's son, she coldly offered her own six-year-old daughter as a replacement—resulting in the girl's slit throat. The father, driven mad with grief, rushed their dying child to the hospital. In her final moments, the daughter begged to see her mother, but Shen Ruyun refused, prioritizing counseling for Lu's traumatized son.The girl died knowing her mother's love was eternally reserved for another child. Enraged, the father attacked Shen and Lu Kai, only to be "accidentally" killed by them. Unbeknownst to the killers, the daughter was secretly saved by a mysterious savior at the hospital. Twenty years later, she returns—for vengeance.