In Tower of God.Join Twenty-Fifth Baam as he climbs each level of the Tower to find his beloved friend, Rahel. Facing impossible missions and mind bending puzzles, he uses any means necessary to reach the top.English translations can be read here: http://m.webtoons.com/episodeList?tit...

    They descend from the skies. They have a hunger for human flesh. They are everywhere. They are parasites, alien creatures who must invade - and take control of - a human host to survive. And once they have infected their victims, they can assume any deadly form they choose: monsters with giant teeth, winged demons, creatures with blades for hands. But most have chosen to conceal their lethal purpose behind ordinary human faces. So no one knows their secret - except an ordinary high school student. Shin is battling for control of his own body against an alien parasite, but can he find a way to warn humanity of the horrors to come?