Master of Both Medicine and Poison: The Dark, Cunning Demon Lord Won't Leave Me Alone

Betrayed by the person she trusted most, she suddenly found her soul transported into another body! She became the useless, ugly eldest daughter of the Mu family. From then on, the useless, ugly girl transformed into a peerlessly beautiful, supreme powerhouse. Alchemy, poison-making, crafting, formations, taming beasts: she could do it all with ease! Divine beasts! Divine artifacts! She could have as many as she wanted! But could someone tell her why this Demon Lord, feared by everyone and uninterested in women, clung to her every day and treated her with such tender, attentive care...?