As it turns out, every so often Kpop groups do covers of classic 90's pop. MYNAME, that debut group who sang the wonderful Message did a cover of Backstreet Boys' As Long As You Love Me on Wave K (a tv show?).  
As a Kpop/pop fan, this kind of thing is very exciting. It combines the nolstalgic past with the trendy dancing present. It's even more exciting when the singers can pronounce English well. However, since MYNAME does the chair dance in one camera shot so that all BSB fans can learn it all is forgiven. Good performance I say.