Tower of God is a manhwa/webtoon from S.I.U. and the Naver corporation. It has 3 million followers on the most known webtoon site (and this 3 million is only the registered ones...).

Tower is God is really a masterpiece what could overthrow the "big 3" (One Piece, Naruto and Bleach) if it would become animated.

I think it would be a total success!