This is entry for http://www.asianfanfics.com/story/view/264824/the-sky-is-the-limit-writing-contest-round-2-bigbang-infinite-shinee-snsd-writingcontest-exo-bap

I used this prompt:

We all do things we desperately wish we could undo. Those regrets just become part of who we are, along with everything else. To spend time trying to change that, well, it's like chasing clouds. - Libba Bray