Han-Soo Kang, a regular boy from the mundane world, gets whisked away to Fantasia, a realm ruled by demons. Proclaimed the Chosen Hero, he dedicates a decade preparing to vanquish the overlord of Fantasia, only to find it surprisingly easy. Just as he anticipates heading back to his own world, the 'god' of Fantasia disrupts his scheme with a twist: a report card exposing the complexities of heroism beyond sheer strength.