Sangnyanghan Namjajuingongui Gamyeoneul Beotgimyeon

As the #1 stalker of Pope Ulysses, the kind male lead, Yoidel was to be executed for her crimes. Just minutes before her end, Yoidel escapes her cell to ask Ulysses for help, only to come across a bloody madman... who turns out to be the male lead himself! In a desperate attempt to survive, Yoidel binds herself to him in a magical contract, dooming the two to share their lives and deaths. Now stuck with a two-faced psycho, will Yoidel find a way to break their bond before it breaks her?

(Source: Tapas)