I think the MV tells what the song is about so well. The lyrics are very cute, too. You should check out the English translation here http://justjyh.com/xe/music/226602 to enjoy it to the fullest.
In the naver music post with Yonghwa and YDG’s video message, Yonghwa says the song is dedicated to all the guys out there earning mileage. http://music.naver.com/promotion/specialContent.nhn?articleId=5491&page=1 I really love that the song is a “real” love song and about “real bromance”. Infinite possibilities from Yonghwa when it comes to music! And this comes from a full length Jung Yong Hwa album!! CAN’T WAIT.
PPS Why the heck certain people aren’t talking about the song nor Yonghwa under the MV youtube? Should not care about a few party poopers. Sorry!