In the decade since he co-founded Shein and turned it into one of the world's most popular fast-fashion brands, CEO Sky Xu has remained a mystery – even to his employees. Now, Shein is preparing for an initial public offering in the U.S. which will put Xu on the global stage. WSJ’s Shen Lu profiles the elusive CEO and describes some of the problems the company is facing as it tries to go public.  Further Reading: - The World’s Most Anonymous CEO Is About to Take Center Stage  - Fast-Fashion Giant Shein Files to Go Public  - America’s Top Fast-Fashion Retailer Tries to Shed Its Chinese Image  Further Listening: - Shein Took Over Fast Fashion. Then Came The Backlash.  Learn more about your ad choices. Visit megaphone.fm/adchoices