Opportunities to change your life doesn't come often. Chances to ruin them do. A single, innocent mistake can turn it all around in so many ways. But, what, what if a little wisp of wisdom is given to them all? Will they use it in the right way? Will they find their way back to happiness?   [Luhan] The sinner, the forever angry, the guilty one who can't ever get himself to do something about it. [Yoona] The unfortunate victim who is und