''Hello'' IS a remake.. Just like SNSD's ''Run Devil Run'' and SHINee's ''Love Like Oxygen'' - 'Hello' IS a remake.
The original artist is a contestant from the Danish version of X-factor (or something..) and his website is
Mohamed Ali
His songs can be sampled on iTunes, from what I know.. He came out with the song WAY before SHINee.
Besides, it's not the first time that SM Entertainment snaps up Danish artists' songs :'3
I couldn't find Mohamed's single on Youtube.. : / sadly.. but I did find Martin's ''Show the World'' single:
YouTube - Martin - Show the World (ALBUM VERSION), that SHINee covered.. ehh.. for their first album :3 I think.