Lee Kang-jun, who was thrown into another world due to the creation of a gate, conquered the vast continent of Anux in 50 years, rising to become emperor and reigning supreme. As a 9th Circle necromancer, he hunted dragons, traveled across dimensions to wipe out all the demonic demons, and went to the martial arts world to defeat the Heavenly Demon and the martial arts leader. He searched and searched for a way back to Earth, and after more than 300 years, he finally returned home... When his older sister thrust a plump, warm creature into his face. "It's your daughter. Her mother died during childbirth... Do you remember?" "Ppa-!" ... That was 300 years ago, before he had even conquered the continent of Anux... "...So, you were an incredibly powerful emperor of some continent? You were trapped in a gate for three years, but fortunately, it ended up being nothing more than a delusion." Even though she was his only older sister, he treated her with contempt and disrespect. The only thing I could agree with was, "But she's your daughter, so you have to treat her well." After all, I was planning to enjoy a quiet and peaceful life once I returned to Earth. From now on, as the absolute ruler, I will dedicate myself to laying a bright future for my daughter, Seol-i.