From mickytoho (uploader + translator):
So, finally! The mystery is no more! The NoKy Brothers HAHAHA Song is part of Samsung's campaign for spreading encouragement - to share laughs & smiles - during these hard times.
So its not a commercial, but a public msg campaign.^^ Very unexpected hahaha! How interesting!^^
I think the message is "when going gets tough, tough gets going! so cheer up!"^^
The NoKy Brothers and DBSK did make me (and all of the viewers) laugh and smile, and made my day, so the campaign has already worked!!!^^
DBSK is so cute!
- from http://www.hahaha4u.co.kr/
The original song is by Jaurim