He needs a fake sibling, and you're a hungry commoner who is desperate for money. What could possibly go wrong? ;)

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Inspired by "High Society" Novel & Manhwa, but some details aren't replicated.

As a witch, you find yourself being hunted by the temple's loyalists, who view your kind as unacceptable within their religion. Fleeing for your life, you stumble upon the tent of the Grand Duke, who surprisingly offers you protection... but not without a price.