SHEIN is the fastest growing fast fashion brand on the planet. You can't finish SHEIN like you can't finish Tik Tok, but there are growing criticisms against this online giant. Journalist Iman Amrani investigates what's behind its meteoric success and #UntoldC4 goes undercover in China where garment workers are working up to 18 hours a day to produce SHEIN clothes. Stream #UntoldC4 Inside the SHEIN Machine on Channel 4 or watch on Channel 4's documentaries YouTube. #Shein #sheinhauls #sheinfactory #channel4 #documentary