Dokuzuki Reijou wa Kekkon ni Tadoritsukitai

One day, two weeks before her wedding, Ellen encounters her fiancé, Samuel, having an affair. She decides to break off the engagement and look for a new fiancé. However, Ellen is the heir to the Bowen family apothecary, who specializes in poisons. She's looking for a marriage partner who will be a great son-in-law, allow her to be involved with poisons, and allow her daughter to become a pharmacist―are these too many conditions?

I want a loving marriage where we can trust each other wholeheartedly. But the only one who understands me is my escort, Stefan... Will Ellen ever find the man of her dreams?!

(Source: Kasakura Publishing, translated)