Nise Seijo wa Hatsukoi no Hakushaku-sama ni Dakareru

Maria, a doctor with the power to dispel miasma, step in as a replacement for the saintess and prepares to marry Count Elvan. In the past, Elvan had saved Maria, but when they reunite, he has transformed into a cold, unfeeling man. Despite Elvan's rejection, Marja persists, striving to fulfill the saintess's role despite her limitations. Her resilience and dedication slowly warm Elvan's frozen heart, and he begins to feel drawn to her. This is the story of a false saintess who melts the count's icy heart and ultimately becomes a true saintess. Source: MU