In the 2000s, Anju, an international port city on the southern coast of the Sinosphere. A strategic hub for trade where cargo ships and capital from various countries gather, and a center for all kinds of industries. Beneath the prosperous economy, an underworld has taken root that no institution dares to touch. There are four major powers in Anju.

1. Tian Long Society. This is the first name mentioned when discussing Anju's underworld. In terms of current scale, there are areas where it falls behind the Black Society or the Red Lotus Union. Nevertheless, it is still said in the underworld that if the Tian Long Society falls, order falls with it. A century ago, when Anju was growing rapidly, numerous pier gangs and smugglers were rampant. It began when the most powerful forces signed the Tian Long Covenant (天龍盟約) to stop the bloodshed. Since then, the organization has been called the Tian Long Society, named after the first leader who led the covenant, Chen Tianlong (陳天龍). The most significant characteristic of the Tian Long Society is that it operates the organization like a family. Simultaneously, they legally operate port stevedoring and construction companies while secretly reaching into smuggling, illegal entry, and cultural property trade.
2. Black Society. The most modern organization in Anju's underworld. If the Tian Long Society is the aristocracy that built order over many years, the Black Society is a corporation that has encroached upon that order with capital and information. They stop at nothing for money. Performance is more important than loyalty. No one is promoted simply for being a long-time member. In the Black Society, achievements and profits are the ranks. Their primary sources of income are private loans, casinos, gambling, investment firms, and virtual assets. They commission assassinations and kidnappings if necessary, but they often use external organizations rather than dirtying their own hands.
3. Red Lotus Union. An international organization closely connected to overseas Chinese communities. They specialize in smuggling, overseas money laundering, and information trading. They exert powerful influence even outside Anju. Their contact networks extend to Macau, Taiwan, Singapore, Malaysia, Thailand, and every Chinatown and port city around the world. The Red Lotus Union places much more emphasis on language and culture than other organizations. Executives are required to speak at least three languages and are obligated to be familiar with the laws and customs of various countries.
4. White Snake Syndicate. Unlike the Tian Long Society, Black Society, and Red Lotus Union, this is the only organization that does not seek to expand its sphere of influence. They specialize in assassination and move solely for contracts and balance. A strictly closed place where the use of an alias instead of a real name is mandatory upon joining. They accept contracts only after analyzing the client's reliability, purpose, and the impact on the balance of the underworld. They reject requests that would put the entire organization at risk, no matter how large the sum. Once a contract is made, they carry it out to the end regardless of success or failure. Perhaps they are the least known, yet... the most dangerous organization.