Devil King x Oracle
Devil king seeks Oracle to save his kingdom. She is flirty and a badass strong female lead.
SPOILER
MC is actually a Fake Oracle in place of the real one. She is actually a female knight that used to be the personal guard for the real Oracle.
Vampire ♂
Giselle, who was in an unhappy and unfaithful marriage, sees a boy her basement. This boy drinks her blood and gets stronger. Giselle and this boy start a lovers affair.
***SPOILER**
The husband is useless, ugly, unfaithful, and old. He is the one that needs her for a title. He falls for a prostitute that deals with drugs and is playing with him for power, status, and money. He starts to crumble too. No chance of MC getting back with him.
Dear Door