To Be His Heroine

Raven had always wanted Akio's attention but he only sees her as his assistant (not even as a friend) and nothing more. Both are immortals who lived for thousands of years. Raven witnessed Akio falling in love with mortal women many times ONLY for his heart to break when they die. She was always there with him in his ups and downs but why can't Akio at least look at her direction?