Available as both manhwa and novel.
Demon King of the Royal Class El Principe Demonio va a la Academia
Also known as: El Principe Demonio va a la Academia · El Noble en la Escuela · El Príncipe Demonio va a la Academia · Học Viện Của Con Trai Quỷ Vương · Mawangeun Hagwone Ganda · The Demon Prince Goes to the Academy · 魔王去上学 · 魔王在学校的生活 · 魔王様は学園に行く · 魔王的學院生活 · 마왕은 학원에 간다
Upon dying, the author of "The Demon King is Dead" is given two choices: go to hell or be reborn in his novel and survive till the end. The problem? He's reborn as Baalier Junior, a weak demon prince, after his realm was conquered! To make things worse, his attempt to escape somehow gets him enrolled as a student of the Royal Class in Gradias Temple, a prestigious human school. In the midst of plotlines and political schemes, can this author keep his identity a secret and reach a happy ending?