Warren Mok, Yin Xiumei, Ruan Yuqun and Wei Song (L to R) sing a song during an evening gala celebrating the 20th anniversary of Hong Kong's return to the motherland, in Hong Kong, south China, June 30, 2017. (Xinhua/Wang Ye)
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Warren Mok, Yin Xiumei, Ruan Yuqun and Wei Song (L to R) sing a song during an evening gala celebrating the 20th anniversary of Hong Kong's return to the motherland, in Hong Kong, south China, June 30, 2017. (Xinhua/Wang Ye)
