Many citizens including Liza Wang (汪明荃) are wearing face masks for protection because of Wuhan virus. In order to reduce the risk of infection, she insisted to wear different colours of face masks such as blue and red to match her outfits, while recording the show a few days ago. Liza also wore yellow, violet and green face masks during other events.

Source: https://ol.mingpao.com/ldy/showbiz/latest/20200221/1582276117358/%e4%b8%8d%e5%90%8c%e9%a1%8f%e8%89%b2%e5%8f%a3%e7%bd%a9%e9%85%8d%e8%a5%af%e9%80%a0%e5%9e%8b-72%e6%ad%b2%e6%b1%aa%e6%98%8e%e8%8d%83%e9%98%b2%e7%96%ab%e9%83%bd%e6%bd%ae%e9%81%8e%e4%ba%ba