As part of the “Enjoy Today” ballad project, Leeteuk and Krystal collaborated on a duet called “Grumbling.” Although the title may sound grumpy (that’s what I thought of anyway), it’s actually a sweet ballad, so if you’re in the mood for something like that, take a listen below!

Their voices meld together very well–I liked their harmonization a lot. I think the song managed to live up to its origins–it certainly helped me “enjoy today” a little bit more!

If you can’t get enough of the two, check out some pictures from “Enjoy Today.”

What do you guys think?

Source: allkpop