Help Me Find This Historical Manhwa

Okay, so basically the basic information:
—FL: Pink Hair (Long)
—ML: Blond Hair

Basically the ML is some sort of cold tyrant uh leader or something, and he's possessed by some sort of god that makes him bloodthirsty/grants him power to kill people easily.

Anyway, this FL has to kill this guy, but she's in love with him (lol) and has that sort of book that only she can see the words in (that book is the events of the story itself). Basically, another god granted her the duty of killing him

Been looking for this desperately, I expected I would find it on the front page because it's INSANELY popular, but somehow my dumbass can't find it