Viktor knew all along that someone from the upper realm will come down to Helsia for giving out a quest in the guild of the central town. But it was three months ahead of the current time and he had a 0.00001 percent chance of meeting the man before that.
Also, there were 0.00001 percent chances of meeting him on the tree so he was quite surprised. Because of his low future predicting skill, there were too many variables in the future. For that, he was always on guard and paid attention to the most peculiar events of the future.
There weren't any chances of it happening but truthfully, the chances were never zero.
Tower, a fantasy-like building also made by Ashter connected every realm together but it doesn't open any gates to it. Usually, a tower is the same as in fantasy books and it has monsters in every floor trail.
Then if it exists in the realm of gods, how do humans know about this and make anime out of it?
It's very simple.