I have always been looking at you, watching you from afar. 
You look happy with him and I'm hurting inside. 
Now that he is gone, shall I continue to hide?
It's either I break a promise or stay by your side. 
~Kwon Jiyong

Meeting you again was destiny.
Being with you makes me happy.
I thought it was really you, but everything's untrue.
It has always been him, the one who loves me true.
~Sandara Park

Fate is sometimes playful. No, most of the time it is. 
 

Two people have been together for a long time. One chose to build a barrier to keep everything inside while the other one thought she has already found what she was searching for. Until a tragic event took place -- He's the only person left by her side and she lost the person she loves. Will he break the barrier and be with her? Will she still smile seeing only him around? Will this tragedy change their destiny or will it just bring them another FATEFUL CATASTROPHE?