A man of concerns (마음속에 있는 사람)-J.E.Rankin & E.S.Lorenz

It's "A man of concerns", arranged in 3 versions. 

The first one is "The original ver."

The second one is "Re-harmonization ver."

The third one is "8-beat ballad ver."

I left the link down there. So please check them out. 

[The original ver.]

https://www.youtube.com/watch?v=OhBbnaaLJGA&feature=emb_title

[Re-harmonization ver.]

https://www.youtube.com/watch?v=pN1J1fmf_KU&feature=emb_title

[8-beat ballad ver.]

https://www.youtube.com/watch?v=wMuDTbMV4xA&feature=emb_title