The world of Caihong City: character bios, history and customs of the city. 

Main form of curency of Caihong City: a special brand of cigarettes that levels out sertraline in the body and helps with boosting one's serotonin, therefore acting as an anti-depressant. The combination of mood booster with nicotine makes for an incredibly addictive substance. An effective appetite suppressant.

An advanced medical establishment located in Furui City and inaccessible to inhabitants of the slums of Caihong City. Presumably can cure all diseases.

A famed establishment that governs over Sektor Meili. Exports Sertra-X from Furui City and holds a tight grip over the market.

A difficult task, usually described by a countably infinite sequence of operations that have to occur sequentially within a finite interval of time. Inhabitants of the Slums are allowed permanent access into Furui City if they manage to complete a given Supertask by a certain date.