Actors perform at the evening party of the opening of the 5th Chengjiang Nuo Opera cultural festival in Chengjiang County, southwest China's Yunnan Province, May 9, 2019. The three-day cultural festival kicked off here Thursday. Nuo Opera, performed with distinguishing masks, is an ancient folk drama which is still popular in some parts of China. (Xinhua/Hu Chao)

Actors perform at the evening party of the opening of the 5th Chengjiang Nuo Opera cultural festival in Chengjiang County, southwest China's Yunnan Province, May 9, 2019. The three-day cultural festival kicked off here Thursday. Nuo Opera, performed with distinguishing masks, is an ancient folk drama which is still popular in some parts of China. (Xinhua/Hu Chao)

Actors perform at the evening party of the opening of the 5th Chengjiang Nuo Opera cultural festival in Chengjiang County, southwest China's Yunnan Province, May 9, 2019. The three-day cultural festival kicked off here Thursday. Nuo Opera, performed with distinguishing masks, is an ancient folk drama which is still popular in some parts of China. (Xinhua/Hu Chao)

Actors perform at the evening party of the opening of the 5th Chengjiang Nuo Opera cultural festival in Chengjiang County, southwest China's Yunnan Province, May 9, 2019. The three-day cultural festival kicked off here Thursday. Nuo Opera, performed with distinguishing masks, is an ancient folk drama which is still popular in some parts of China. (Xinhua/Hu Chao)

Actors perform at the evening party of the opening of the 5th Chengjiang Nuo Opera cultural festival in Chengjiang County, southwest China's Yunnan Province, May 9, 2019. The three-day cultural festival kicked off here Thursday. Nuo Opera, performed with distinguishing masks, is an ancient folk drama which is still popular in some parts of China. (Xinhua/Hu Chao)

An actress performs at the evening party of the opening of the 5th Chengjiang Nuo Opera cultural festival in Chengjiang County, southwest China's Yunnan Province, May 9, 2019. The three-day cultural festival kicked off here Thursday. Nuo Opera, performed with distinguishing masks, is an ancient folk drama which is still popular in some parts of China. (Xinhua/Hu Chao)

An actress performs at the evening party of the opening of the 5th Chengjiang Nuo Opera cultural festival in Chengjiang County, southwest China's Yunnan Province, May 9, 2019. The three-day cultural festival kicked off here Thursday. Nuo Opera, performed with distinguishing masks, is an ancient folk drama which is still popular in some parts of China. (Xinhua/Hu Chao)