Wang Jie and Wang Yu. Douyin Jieyu is the Douyin account of a pair of twins. The names of Douyin are chosen from their respective names. The sister’s name is Wang Jie and the sister’s name is Wang Yu. Douyin is a music and creative short video social software incubated by ByteDance. The software was launched in September 2016 and is a short video community platform for all ages.