Solo Login 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 Solo Login chapters on https://mangabttt.com, fastest updating comic site. The Summary is
11-year-old Jung Si-woo never had any friends, because there was nothing interesting about him. He lived an average life as an average person in an average world. But suddenly, the earth faced a great change when Mysterious floating 'Sky Castles' appeared. The 'Sky Castles' granted some people wings and powers, but unfortunately, Si-woo wasn't one of them.