Where am I...? The last thing I remember is making a wish on my birthday and then going to sleep. This is strange.....this isn't my bed.....

A story about a girl who wishes for pleasant dreams and wakes up to find herself in Choi Siwon's bed. Without a clue of how she got there or how to get back home, will she be able to return to the life she knows? Even then, what will Siwon do when he finds a complete stranger in his bed?