I Quit Being My Sister's Spare — Don't Call Me the True Saintess Now! Manga
'Ane no Spare' to Yobareta Migawari Jinsei wa / Kyou de Yameru Koto ni Shimasu ~Henkyou de Jiyuu o Mankitsu Chuu na no de / Imasara Shin no Seijo to Iwarete mo Shirimasen!~ / I'm Ending My Life as a Substitute Called "My Sister's Spare" Today ~I'm Enjoying My Freedom in the Frontier / So I Don't Care If You Call Me the True Saintess Now! / I'm Quitting the Substitute Life Called "My Sister's Spare" Starting Today – I'm Enjoying My Freedom in the Frontier / So Don't Call Me the True Saint Now! / 「姉のスペア」と呼ばれた身代わり人生は、今日でやめることにします～辺境で自由を満喫中なので、今さら真の聖女と言われても知りません！～ / 언니의 대체품은 오늘로 그만두겠습니다
Twin sisters Mocha and Karina, designated as royal saints due to their unique healing powers, find themselves in a constant cycle of work after Karina abruptly abandons her responsibilities, leaving Mocha to manage both roles. One fateful day, Karina takes credit for Mocha's efforts and announces that she is no longer required as a "sister's spare," compelling her to marry Alexis Veliki, the leader of the cursed knight order. However Mocha is excited about the idea of a fresh start, thinking, "I’ll be free from this tough job!" and sets off to the frontier territory filled with enthusiasm. Yet, what Mocha encounters in this remote area, known for its ominous tales, is her ill-fated husband, Alexis, who holds animosity toward saints, along with the members of the cursed knight order—…? Original Webtoon