Lua is a candidate for sainthood with the power of healing, but her ability comes with a cruel drawback: in order to heal others, she takes their injuries and illnesses into her own body, enduring the pain and suffering herself. While the other saint candidates looked down on her as “defective,” her best friend Arianne always defended her. One day, the knight commander Garrot, the man Lua secretly loves, is gravely injured. Lua heals his wounds completely, but the effort pushes her to the brink of death. When she finally awakens, she discovers the credit for her miracle was given to Arianne, and Garrot is now engaged to her treacherous friend. Having witnessed Arianne’s true nature and facing Garrot’s cold rejection, Lua falls into despair and swears never to heal anyone again. At that moment, Second Prince Sven appears with an offer: “Why don’t we take revenge on those who humiliated you?” Revealing her hidden, second ability— the power to inflict the pain and ailments she once healed onto others— Lua joins forces with Sven to abandon her life as a saint and begin a new life as a villainess bent on retribution.