I really like this song and also watched the mv.As a fan of YongSeo,I made a video with that song.But I'm not sure it's a correct storyline like the mv.Can someone tell me the true storyline of that mv?

From my pov:

In that mv,Kyu and Vic had an accident.Vic died and and Kyu lost memories.Through that pandora's box,Kyu started to remember Vic.

If I was wrong,hope someone can correct me^^