Margrave’s Bastard Son was The Emperor

"An emperor who died unjustly becomes a wretched bas**** son!" Ian, a wizard of the Bariel Empire, became emperor at a young age, but was imprisoned due to his nephew's rebellion. However, he was saved by the wizard Naum using forbidden space-time magic. This magic leads Emperor Ian 100 years into the past, where he possesses Bas**** Ian, the illegitimate son of the Margrave family that went extinct 100 years ago. Bas**** Ian is about to be taken hostage by the barbarians! Ian is about to get caught up in a blo*** conspiracy!!!