Why is the glutinous rice liqueur I bought not sweet?

Glutinous rice wine can be divided into white and red.

White, also called liqueur or mash, is very sweet when it is first made. If it is left for a long time, it will continue to ferment and then it will not be sweet.

Red rice wine, also known as red rice glutinous rice wine, is basically not sweet, unless the temperature is too low when brewing, so that the fermentation time is too long, and the brewed wine will be a little sweet, but it is also a little sweet.