100 years after the "Holy War" between the Demon King and the heroes, while enjoying the peace created by their predecessors, they still can't stop fighting.

When presumed-beta Yoo Hansol visits the doctor for some concerning new symptoms, he's surprised to discover that instead of dying, he's actually an omega! Totally unused to the realities of being an omega, ...

At the age of eight, Ijin Yu lost his parents in a plane crash and became stranded in a foreign land, forced to become a child mercenary in order to stay alive. He returns home ten years later to be reunited...

Koide was turned into a vampire at the age of sixteen--one hundred and thirty three years ago. Now, poor Koide is trapped in an eternal loop of the same old homework, the same boring lectures and meaningless...