Holy Emperor’s Grandson is a Necromancer

A brief description of the manhwa Holy Emperor’s Grandson is a Necromancer:

Our MC dies from an accidental electrocution and ends up inhabiting the body of a young prince in another world, his new profession being the Necromancer he chose in the game he was playing before his untimely demise. However, things are not what they seem – including his own Necromancy skills!