Mr wang only works in a restaurant as an hourly worker at weekend . ps: Xiao wang means he or she is young . Lao wang means he or she is old. It is relative. if a person who was 50 years old meet Mr wang whose age under 50 ,he could call him Xiao wang Be careful, it isn't polite in a formal situation in china. eg: you couldn't call your boss or federal officeholder in a important department xiao wang or lao wang .he will be very angry we always called them "Ling Dao " . >.>

In my opinion, it means that " Wang spends his weekend on doing part-time job in hotel. He will not be there on weekdays.

Xiao Wang works part-time in a restaurant at week ends, not on work days.