In 2006, Tse started garnering more media attention, first losing her dental braces she had worn for many years. On 2 June, she released the EP, "K sus2", which contained the first single "Gloomy Festival" (愁人節). The single received positive critical reception for raising concern about disadvantaged groups in society. It garnered a decent amount of airplay and became her first single to peak within the top 10 of all four major charts, reaching no. 1 on both the TVB and Commercial Radio charts, and winning her first year-end song award at the 2006 Ultimate Song Chart Awards.