SuperString: Isekai Kenbunroku is a Manga/Manhwa/Manhua in (English/Raw) language, SUGGESTIVE series, english chapters have been translated and you can read them here. You are reading chapters on ManhwaZ fastest updating comic site. The Summary is
The story of a young man who fights alone to protect his family in a world where heroes from various dimensions wage war on Earth. The One Hundred Doctrines, an unknown group that plans the downfall of humanity, and the heroes that oppose them, the “Super Strings”. Our protagonist “Marco Polo” was summoned to another world by them and thus started his never-ending journey. Just what the hell is justice? Which is more important? The fate of mankind or his family? What awaits for Marco Polo on his journey haunted by such unanswerable questions!? The story by the extraordinary storyteller Yoon In-wan accompanied by the dynamic otherworldly action drawn by the amazing artist Boichi finally begins!