Kaiki mo 13-kaime to Naru to Shoujiki Shindoi

After living the same life 12 times, Joo Gong-Hyuk has perfected the method for conquering the Tower of Babel. His only problem is that no matter how many times he climbs it, he is unable to stop the destruction of the world. But not this time! His 13th return is going to be his last, and he'll stop at nothing to save his friends and stop the apocalypse. Will his knowledge from climbing the tower 12 times be enough? Or will Gong-Hyuk be forced to watch as the world meets its end once again? (Source: Tapas) Note: Includes one extra chapter.