Queenie's manga / #split personality(1)

Why are you doing this, my Duke!? Webtoon

Ongoing | 반달반지 | 2000 released

About a girl who almost killed by the Duke saved after a magic circle suddenly appeared and changed the duke's personality in which fell in love with the heroin, but as the story goes on, the affectionate duke suddenly become himself in one night they're together , and that's how the heroin knew of his split personality and that's how the story itself begin