小三上了档次闺蜜成了仇人
[xiăo sān shàng le dàng cì guī mì chéng le chóu rén]
This name reflects a bitter and dramatic situation where the user became a mistress ('little third' or 'mistress' in Chinese) with more sophistication while her best friend turned into her enemy. The implication is that relationships and loyalties can drastically change.