Ploty

There was a very old manhwa that I been thinking maybe early 2000 or 2010.

There is a human child befriending a vampire child in the human world. The characteristic of vampire were, they have red eyes, each one of them. The interesting part was that the human child also have red eye(not albino).

One day(I don't remember what happen) the human child went into the vampire world by this door. While they did find each other, something happen to the door.

So the human child stay there while hiding his human characteristic from the vampire. They go to school together. The vampire child is a child of some kind of higher vampire, he was birthed while his mother in a slumber and his father was not happy by his existence.

Then something happen to the vampire world. Since their existence was hidden from human world. The world about to collapse. So the children went to find the creator of the world with secret. While the father plotting something.

That all I remember. The vampire child has black hair red eye. Human child blond? hair red eye. Their founder has pink hair?

Please some one help me!!!!!
I've been thinking bout this manhwa a long time but I couldn't remember.

The art might not beautiful like today manhwa. Maybe look alike like old Blaze Haze manhwa.

The last time(long time ago) I read the manhwa is still updating.

Guys any recommendation for student x organization?

By student, I mean as a student status before joining organization or after joining the organization. As student in school or college.

Such as Young Gun Carnaval, Mercenary Enrollment, Code Geass, World trigger, Kill blue(?), Full metal panic.

U guys understand right?

Student X Organisation