Recently, a piece of news is spreading on major BBS sites in Guangdong that "Highly simulated 100 yuan counterfeit RMB notes are prevailing in Guangdong recently. The serial numbers start with HD90. Everyone should be alerted not to be defrauded". After investigation by our reporters, this is not an ungrounded rumor. Many web users in Guangdong responded that they received counterfeit 100-yuan notes starting with HD90 recently. Even many bill checkers could not identify them.