After losing his ability, Jack Copper is forced to retire as a hero and he starts up a new normal life.

Currently, Jack is married and has twin children who are 5 years old.

Nevertheless, he encountered financial difficulties in sending his sons to the ability academy. He didn't think his kids would have abilities because his wife was an ordinary human, so the possibility of a child being born with abilities was rather low. With a career as a salaryman, his earnings were not sufficient to get his kids to Academy.

Hence, he decided to become a hero again, even though he had lost his ability and started from the bottom.

He was confident in his martial arts and the knowledge of being a hero for more than 30 years. He was sure that he at least could beat the low-level dungeon monster without risking his life.