I came across this video where Heeseung and Rei (IVE) both (individually) did the cover of luther by Kendrick Lamar and SZA. Their voices are complimenting each other so well!

https://youtube.com/shorts/KfXCuDHiR7c?si=Q3wRBGd3HjLJkCer

I really wish we get Enhypen boys covering a duet with any 4th gen girl group as they used to do it in 2nd and 3rd gen. I know it is always once in a blue moon.