This is Whampoa Market, it can be found her, just outside Balestier
Whampoa Market is an extremely big market where there are many stalls, they sell many things as well, such as food, toys, fish, turtles, plants, clothes, etc. And there are more workers than there are stalls! It is really popular amongst those living near it, they go there to buy their groceries, especially the elderly.
This market is very old and most of the hawkers there have been working there for a very long time. Most of the elderly have fond memories in Whampoa Market, thus, they go back there for groceries instead of supermarkets.