Ari no Su Dungeon e Youkoso!

Ari no Su Dungeon e Youkoso! is a Manga/Manhwa/Manhua in (English/Raw) language, Action series, english chapters have been translated and you can read them here. You are reading chapters on the fastest updating comic site. The Summary is

When I woke up, all I had were an unfamiliar room, a crystal, and no memories--just "me." Awakened as a Dungeon Master, Dan starts with a few points and uses them to summon ant monsters to expand his dungeon. Alongside the ever-increasing and evolving ants, he repels intruding enemies, occasionally recruits allies, builds an impregnable mega-dungeon, and aims to find new happiness and everyday life within the dungeon!