Wonder Tower is a Manga/Manhwa/Manhua in english language, Action series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.nl fastest updating comic site. The Summary is

Gan Lin was summoned into a world specially established for cultivating the strong. How can Gan Lin, who has no strength, potential and background, survive in the world of the weak and strong? Facing absolute dark rules of cannibalism and becoming stronger, will he stick to kindness? Or will he be complicit?