Donghae is mainly a model and has always been fascinated by Hyukjae's work both as a singer and dancer. Once, they happen to stay at the same hotel and since they are very well aware of the mutual admiration, Hyukjae visits Donghae's suite. Needless to say that the atmosphere gets steamy hot quickly, but in the aftermath, they eventually write down a bunch of lines for a song and they decide to actually film a Music Video for it. The song gets a huge amount of attention and their collaboration brings them to work more closely: photoshoots, interviews, and so on till they begin growing feelings clearly seeable on screen and it quite becomes a meaningful song as they always sing it on tours.