Teleportation took Tang Yin to the first subway city he built. It is just below where the Red Thunder Sect used to be, but deep underground.
During those three years, Tang Yin made full use of the resources at hand to create many organizations and make them strong. Thanks to his abilities and Natural Law, he obtained much wealth from all over the continent, taking advantage of the sale of spiritual herbs.
Although, at the time, he had a disagreement with the Alchemical City in the northwest, which is what makes them unfriendly to each other now. That was because Alchemical City sells the most spiritual herbs to nearby regions. When Tang Yin entered the market, it started stealing ground from them quickly, which annoyed them.
Still, his plans would not stop just because of a stupid, arrogant little town. That's why he decided to undertake a different project. One that would allow him to have the broadest possible reach on the continent.