On the eve of her wedding, a woman is repeatedly misjudged and hurt by her fiancé due to her sister's lies—so she lets go, swaps brides with her sister, and willingly marries the legendary bloodthirsty half-beast. When the truth is revealed and her regretful ex rides to take her back, she has already found true love in the beast's keep—shielding the half-beast with her own body, breaking the curse through true love, and marrying the prince restored to human form.