MTL - The Lucky Farmgirl has a Pocket Dimension - Chapter 283 solved the case

Dying in a tragic accident Marcus Ferrous gets transferred to a fantasy world of monsters and magic, except when he arrives contrary to what he expected he is now level one and a ghost. Left with nothing on a strange new world, Marcus will struggle with everything he has on his journey to get stronger and uncover the secrets of his new world.

Childhood sweethearts.
The most popular person in school is my childhood sweetheart.

- Description from Novelupdates

Living a fairly common life, Brian lost his parents at the age of twenty at the hands of vampires. But he never imagined that he had a daughter and she was a vampire.

Elenor was raised by her mother, learning to become the next head of the Vampire Family. Seeing the pressure and loneliness of her mother, an eight year old Elenor decides to find her father and help them patch up.

But, who would have thought that her father had no love for her mother, he doesn't know much about her. Instead he fell in love with an werewolf, her racial enemy.

But, it wasn't her story. Brian had a lot more going on in his life. With a new daughter and a girlfriend, his life began to drastiscally change. From solitary and lonely life to a life filled with excitement and love. Can he handle it? Can he raise his daughter? Will he ever love her mother?

In the age of post-apocalypse, Brian at the age of twenty-five starts a new life filled with Virtual Reality, Superheroes, Evil Aliens, Vampires, Werewolves, and most importantly, Techs.