Taeyeon was never a superstitious person. Not until that incident. Since then, she escaped from the cruel reality and locked herself up in her own world. It was never her choice, but it happened.  "There is only one key to the lock. And i'm sure that he is not the correct key."

What would you do if you saw the man that appeared in your dreams? It was believed that such rare opportunity happened only once in a century. And what would Seohyun do if she happened to meet her prince charming?