TVXQ "Mirotic" The first time I heard this song, EXO-M had done a short version (followed by EXO-K doing Sorry, Sorry). I had to find out who sang it. I had just started listening to Kim Jae Joong and seen him in the video. Anyways, I really like this song. But BTOB's cover is so good.
BTOB They did a great fraking job on this.
SHINee Did a vocal version but has also performed on stage with TVXQ! at SMTown in Osaka (2015)