How did the supreme title of Shacheng come from?

In the game "Think Forever 6", you need to complete the following steps to get the supreme title of Shacheng:

1. Become the Lord of Shacheng: In the battle for Shacheng, the gangs that occupy and hold Shacheng will become the Lord of Shacheng.

2. Upgrade Shacheng: The city owner needs to spend a lot of resources and gold coins to upgrade Shacheng, up to 10.

3. Get the Supreme Throne: The Lord needs to build the Supreme Throne in Shacheng and upgrade it to 10.

4. Get the supreme title of Shacheng: The Lord needs to use the designated items on the Supreme Treasure to get the supreme title of Shacheng.