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She was betrayed by the person she trusted the most, and her soul was instantly pierced! She became the good-for-nothing ugly eldest daughter of the Mu family. From then on, the good-for-nothing ugly girl turned into a stunning and top-notch expert in alchemy! Refining poison! Refining weapons! Formation! Control the beast! Just pick it up! Divine beast! Artifact! As much as you want! But who can tell her why this demon king, whom everyone talks about as a pervert and not close to women, clings to her every day and still cares for her carefully and considerately...