Neverending Necromancer

A young man from a high-class noble family hastily leaves his home by the order of his father. On his way to go to a friend's family, he encounters nightmares and fear manifestations. The fact that Lankiar hides a deep secret from everybody—the fact that he is Earth and has a system—is a hidden secret for him.  With his evil mind and ability to have power, what will he do in a fantasy world with magic and monsters?