The main character hides his strength

Kim Seong-cheol, the legendary summoner called ‘the enemy of the world’. (Physique Lv. Max) He faced the disaster alone to prevent the coming end of this world, but there was no way to deal with the Demon King, who had turned into a spirit body impervious to physical attacks. He realized that he needed magical power to achieve his goal. Hiding his existence and power, he goes to the ‘Summoning Palace’, the place where he was first summoned to another world, and begins training as a novice wizard…