* Low brow and vulgar? Micro dramas shake up China’s film industry, aim for Hollywood   China’s $5 billion micro drama industry is booming * Bytedance and competitor Kuaishou among successful first movers * Companies with Chinese ties creating short videos for U.S. customers * Micro dramas often feature revenge or rags-to-riches stories By Antoni Slodkowski ZHENGZHOU, China, Sept 21 – On a film set that resembles the medieval castle of a Chinese lord, Zhu Jian is busy disrupting the world’s second-largest movie industry. The 69-year-old actor is playing the patriarch of a wealthy family celebrating his birthday with a lavish banquet. But unbeknownst to either of them, the servant in the scene is his biological granddaughter. A second twist: Zhu is not filming for cinema screens. “Grandma’s Moon” is a micro drama, composed of vertically shot, minute-long episodes featuring frequent plot turns designed to keep millions of viewers hooked to their cellphone screens – and paying for more. “They don’t go to the cinema anymore,” said Zhu of his audience, which he described as …