Lucas

He used to live in the Tower with a silver-haired man, this man told Lucas he would live a lonely life. From time to time, he has to travel to another dimension to find the World Tree and its fruit to replenish his mana. In the first episodes of the manwha, Lily is reading a historical story to baby Athanasia, in which the Magician from the Tower is depicted as a powerful man capable to destroy an empire in just one day. This is why the magician froze his heart, so he could always make rational decisions.