Production Companies: Azit Film , Kidari ENT , Sony Pictures Entertainment Korea , Sony Pictures International Productions , Columbia Pictures .
Overview: Young-ho doesn't have any dreams for his life. He has been studying for three years to enter a university. He decides to send a letter to his childhood friend So-yeon. But her younger sister So-hee receives the letter instead of her sick sister. So-hee writes back to Young-ho, pretending to be So-yeon. Meanwhile, So-hee takes care of her sick sister and also runs a secondhand bookstore with her mother.
, Sony Pictures Entertainment Korea , Sony Pictures International Productions 
, Columbia Pictures 
.
