Does such a thing exist?

Does anyone know of a manga website or app? Free (no membership required), no ads (the annoying kind), downloadable for offline reading (so I can read it where there's no internet). And it should have Japanese, Korean, and Chinese comics. (Especially works by Zhu Yi, because I'm reading them recently but can't find a good source. (Baozi Comics is missing pages, ahhh) (Official or pirated is fine) Hmm... hope this post doesn't get deleted.