Tower of God

is a Korean Webtoon series created by the Korean artist SIU (Slave.In.Utero).

Tower of God has been running weekly on Naver since 2010 and is currently comprised of two seasons, Part I and Part II.

Plot
Twenty-Fifth Baam is a young man who has never experienced society and the presence of others except Rachel - the only girl he ever cared for and about. He desired nothing more than to continue living with her. However when Rachel wants to reach the top of the Tower, she embarks on her journey with Baam desperately following in her tracks...

Official

 * Naver (Korean)
 * LINE Webtoon (English translation)

Other Sources

 * Tower of God (Wikipedia)
 * Tower of God (TV Tropes)

Other Wikis

 * Torre de Dios Wiki (Spanish wikia)