The Knight King Who Returned with a God

21st Century Adventurer/s Appearance Different from Actual Age Arrogant Protagonist Based on a Web Novel Beautiful Love Interest/s Blonde-Haired Protagonist Demon/s Different Culture/s Dungeon/s Dungeon/s Exploring Dungeons Invade Earth Eccentric Male Lead Emperor/King Male Lead Facial Expressions Full Color Gateway/s Honor Hot-Blooded Protagonist King/s Knight/s Male Protagonist Memories of Past Life Noble Male Lead Noble Protagonist Older Than They Look Overpowered Protagonist Protagonist Strong from the Start Queen/s Reincarnated in Another World Religion Religious Fundamentalist/s Returnee Returning from Another World Reverse Isekai Skill/s Strong Character/s Strong Protagonist Strong-Willed Male Lead Tradition/s Tragic Past Urban Fantasy Webtoon