Among the three families with inhuman power and influence,
Saint Beryl must discern the devil.

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 take cruel revenge on those who killed her.

That’s how Beryl entered the devil’s castle.
Beryl, who had only learned how to restrain her desires in the temple,
learns how to truly
desire from the unholy and sweet devil Vine