Yae a man that has a career of a pro gamer in 20 years, his team is a pro gamer champion in 20 years but when he died his team fall. when he was been reincarnated he witness the dungeon that sort of like a hell hole. he familliar with this type of dungeon because he been playing an rpg,mmorpg games for 20 years. he noticed that floor level has been conquered was only 20 levels. role delegation is lacking.