Yongmangeul Gareuchyeojuseyo

Saint Beryl must discern the devil among the three families with inhuman power and influence. Only her divinity can discern who the devil is. 'Who will you marry?' In order to escape the two hellish lives before, Beryl chooses the real devil, Duke Vine. In order to survive a cruel death, and perhaps to achieve cruel revenge on those who killed her. Thus, Beryl enters the devil's castle. Having only learned how to restrain her desires in the temple, Beryl learns how to truly desire from the unholy and sweet devil Vine...!

(Source: Naver Webtoon, translated)