Young K and Wonpil's Shut the Door Challenge: Matching so well it's like they recorded together

Young K's Shut the Door Challenge is really hot these days, isn't it?

Someone put the version sung by Younghyun and the version sung by Wonpil together, and it seriously gave me goosebumps.

Anyone looking at it would think they recorded it as one song.

I guess they're a group for a reason...

It sounds so good with the real voices added together ㅠㅠ

So I realized why everyone eventually comes back to Wonpil.

It seems like Wonpil sang his own song for the challenge.

I wish Wonpil would sing the full version of "Shut the Door" instead of just this short challenge version.