My Dragon Lord Contract Husband

Hidden healer-witch Ella mistakes dragon duke Cary for an escort and sleeps with him, leaving a potion that heals his long-broken dragon core. They sign a 500-million-star-coin contract for her to pretend to be his wife. After surviving plots, Ella publicly reveals she is the true high-level healer. Cary, who knew her identity all along, burns the contract and confesses his love.