Jaeanggeum Necromancer Euntoehaneun Beop

A man named Jihyeok spent thirty years in another world under the control of an archmage before being sent back to Earth with a large amount of treasure. Upon arrival, he finds his wealth gone, leaving him only with his necromancy abilities and a laid-back demeanor. During his absence, monsters have invaded Earth through mysterious gates. To survive, he pretends to be an Awakened individual and uses his powers to summon skeleton armies. Rather than fighting the monsters, he uses them to build a business, aiming to secure his retirement with minimal effort.