After falling into another world through a gate, Lee Gang-jun conquered the vast Anux continent in 50 years and rose to become emperor, reigning as an absolute being. As a 9th Circle Necromancer, he hunted dragons, crossed dimensions to sweep away all demons from the demon realm, went to the martial arts world and defeated both the Heavenly Demon and the Martial Alliance Leader. After searching for a way back to Earth for over 300 years, he finally managed to return home… only to have his older sister thrust a plump, warm living creature at him.​ “This is your daughter. The mother died during childbirth… do you remember?” “Ba-bba-!” …That was from before he even conquered the Anux continent, so it happened 300 years ago…​ “…Right, weren’t you some incredibly powerful emperor of some continent? You were trapped in the gate for 3 years before returning, but fortunately you only ended up with delusions.” No matter how much she’s his only sister, she’s treating him like a madman. The only thing he can agree with is: “But since she’s your daughter, you have to take good care of her.”​ Since he planned to enjoy a quiet, peaceful daily life after returning to Earth anyway, from now on he’ll use all his power as an absolute being to lay a bed of flowers for his daughter Seol’s future.