His Brother's Secret Substitute: Married to the Dying HeirEpisode 21

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Forced to be her stepsister’s bed substitute, maid Aria chooses a blood‑bond marriage with dying heir Caius to escape her fate. As they grow to love each other, bitter family conflicts erupt. Betrayed and imprisoned by her cruel stepsister, Aria is rescued by Caius, and the pair fight to break free from their tragic destiny.