내 남자친구에게 (To My Boyfriend)

Ha, I just "found" this performance. I didn't know they did this special stage. The song is 내 남자친구에게 or To My Boyfriend by Fin.K.L from 1998. Along with S.E.S, Fin.K.L was probably one of the most famous girl groups in K-pop, ever.

Here is the special stage with Seolhyun (AOA), Tzuyu (TWICE), and Hani (EXID):



This is one of the original performances by Fin.K.L 20 years ago:



I think Lee Hyori is the 3rd girl to sing in the old video.

Here is another special by the same three girls in the first video, singing some Wonder Girls songs:



BTW, Tzuyu (first girl to sing in the last video) is not Korean. She is actually from Taiwan.