The immortal half blood

A young man Kevin Norah(25), With a blood of an celestial being and a human because must avenge his girlfriend and his family death by a rogue immortal knight.

500 years later to the present. He becomes one of the best immortal knight in existence, thanks to he's mentor, a drinking, fun, ladies man named Nathan Mondur. He now has to protect the world from rogue monsters, creatures and other mystical creatures from corrupting man kind.

He soon had to join forces with a female vampire. Even though they hate each other because of their past lives and tragic memory they still join forces to find the man who killed his family and his girlfriend.

The weird thing is that the female vampire is someone he loved but he doesn't know because of something.