Tower of Babel Made of Ivory

A willful work that is so unconventional that it is difficult to classify - Yang Zhicheng, a physicist, engineer, thief, killer, and otaku who was involved in too many things, tried to hide away forever in the rebuilt city, but fate made him involved in new troubles. This time it's worse than fighting alone. Not only does he have to deal with a long-term threat, he also has to deal with his nominal "son"...