In 2005 Sit went on to film her first Hong Kong TVB series The Academy, her role was a female police trainee. To meet the job requirement of her character, Fiona cut her hair short. In contrast to her past success, fans responded negatively towards this change in her image, and were wary of her future career decisions. She followed with a cameo performance on On The First Beat. Sit also featured in a weight loss product TV commercial, in which she performed a dance routine. These two events were mocked in the Hong Kong media, and cut into her fanbase.