those PVs are actually taken from the short movie..
they just divide into two so it looks like that there are two videos for each of the songs.
original ones are the extended version ones...
both are more than 5 minute length..
different from usual PVs length.
so actually, if you watch both extended version PVs , you're certainly watching Distance Love already.
you can only watch Distance Love, the short movie in the DVD..
or here the online streaming one (if u want to take a look):
http://www.tudou.com/programs/view/kwldM9BcJlo/
at the end of the movie, Secret is being the background music come together with the credits and pics of them during the filming.