A Breakthrough Brought by Forbidden Master and Disciple

Story:

"Compared to our time, the current generation is not so reliable," they said. And yet isn't he the son of the hero, how irritably 10 years have passed since the battle between people and demons ended. The children of the heroes who saved the world grew up and one of them is Eirth. He was a talented man and everyone expected him to repeat his father's success as a warrior and protect his country, but Eirth was always cautious about the title of father.