Mei Aisi owes his business to his Internet celebrity, and his celebrity to his wife. Before he met her, Mei, a working-class native of the northern Chinese city of Chengde, didn’t have much going for him. He’d scored poorly on China’s college entrance exam and his prospects at home seemed dim. But after he followed a friend on a whim to Ukraine, he eventually managed to secure a place for himself in a fine arts program in Kharkiv, Ukraine’s second-largest city.