The Murderer Targets the Brunette Lady

I was reincarnated into a novel featuring a murderer who targets only women with brown hair and green eyes. ...And I was reborn as a noble lady who possesses both of those traits. To avoid being found by the murderer, Selinia confined herself to her room, living a machine-like existence making potions. She hoped that if she could just endure for six more months, the main characters of the original story would surely defeat him. But just at that moment... The murderer himself appeared before Selinia. "I am Eon de Granfleur , the Master of the Magic Tower. I have come for you."