After a dramatic turn of events, Astina's tranquil existence takes a sharp detour as she is traded to Grand Duke Theodore following her father's financial ruin. To her surprise, the grand duke is cursed with a beastly form. Contrary to expectations, instead of meeting her demise, Astina endeavors to subdue the monster with her exceptional sword skills, eventually turning it into a companion. Through a simple act of praise one evening, a brief kiss changes everything. Astina's beastly companion, Theodore, undergoes a miraculous transformation into a human. Thus begins a heartwarming love story between this unconventional pair – the once monstrous husband and the carefree wife.