Learn from "Student Zhang"！

Ten million new subscribers in three months, a single video for more than 100 million views, a large number of netizens are studying and even imitating 张同学 (Student Zhang). At the same time, the burst of popularity was followed by concern and curiosity about him. Is he a professional director? What is the team behind him? How much money can he earn? And most importantly - how in the end did he go viral?