Sage-King Government means the Country Government takes care of the people population as main priority.
It means the Country is very well run. There are enough Foods & Money to go around in the People Populations. Moreover. Housings are cheap & the People Populations once reach marriage age. People are able to get married monogamy easily. There are also many Interestings Jobs around for the People Populations to do.
According to Confucius, this Sage-King receives Heaven (GOD) Mandate to govern the Country. *Note: according to Confucius, this Heaven (GOD) Mandate can also be easily losed if the sage-king sins too much & loses it. It is very difficult to get, but easy to lose.
The Sage-King Government is governed by an Sage-King (i.e. in modern term may be an Emperor, President or Prime Minister.)