The Hero Became the Duke's Eldest Son

The Hero Became the Duke's Eldest Son

Aden Albireo, the \"Dragon Slayer King\", was a hero who saved the world by eliminating the Berserker and the Underlord. However, he was betrayed by those who whispered friendship to him, and met his death... \"I didn\'t know I would be resurrected like this?!\" 15 years before the Underlord\'s resurrection, \'Aden Albireo\' reincarnated into the body of the eldest son of a unheard-of duke\'s family, \'Aden Remes\'! And... \"It\'s been a while, Dragon Slayer King!\" \"The Underlord I thought I had defeated is inside my soul?!\" Will Aden be able to end his uncomfortable cohabitation(?) with the Underlord and prevent his resurrection?