Soaring dream: Aviation fan sells 16 million paper planes in 5 years
Liu Dong reviews drawings. [Photo/VCG]
Liu Dong (right) checks a drawing. [Photo/VCG]
Liu Dong test flies a paper plane. [Photo/VCG]
Liu Dong poses with his paper planes in Qingdao, East China's Shandong province, July 9, 2018. [Photo/VCG]