Ditched My Wolf Fiancé for the Beast King

Wisteria, a nine-tailed fox shifter, is betrayed by the fiancé she trusted and by her adopted sister, who conspire against her. Stepping into her sister's place, she weds the Serpent Lord, a ruler the whole realm fears. To her surprise, he is the one person who genuinely cares for her. Years later she has become a celebrated alchemist, and her former fiancé and family now beg for a forgiveness she has no intention of granting.