Silver Demon King

은빛마계왕 · Silver Devil King · 銀光の魔界王 · Серебряный король преисподней

Yooan Ha, a high school senior, messed up his SATs because he mismarked his papers. He is approached by a foreigner- no, a demon who proposes to turn back time. In exchange, Yooan must stand in as the demon king's replacement... Will Yooan, living the demon king's life, be able to safely return to his own life? “Should I live however I want? I'm the real king until the real one returns!”