During NCT Vlive (Korean Video Broadcasting App) they were monitored by SM Entertainment staff. In this Vlive the members were talking and making snacks and when WINWIN was mentioned the staff told Renjun not to talk about WINWIN.
The members were clearly unhappy and shocked. However, once the broadcast was uploaded this whole scenario was edited out of the clip. This statement was contradicting because SM Entertainment made it very clear that NCT consists of 21 members. However, their statement about not mentioning one of the members says otherwise.
This mistreatment is shown mostly towards the Chinese members. On Twitter, the #SMTreatChinaLineBetter has been going around for a long time, but SM just does not want to hear what the fans have to say. This whole incident highlights mistreatment towards different members and how context is manipulated according to what the company wants to show.