Hero Killer Academy

After the world's strongest hero betrays his closest allies in the hero group called Enders, the Enders create the Hero Killer Academy to train heroes in the world to kill the #1 hero, the worlds strongest hero, Sun. Arriving to join the Hero Killer Academy, unaware of what that academy was really for, was 18 year old Joon. A nerdy nice boy who has a system to level up his power unlike anyone else in the academy…