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.

Cast:Kang Ha-neul, Chun Woo-hee, Kang So-ra, Lee Sul, Lim Ju-hwan, Lee Hang-na,

Genre:Romance, Drama,

country:South Korea, United States of America,

Production:Azit Film, Kidari ENT, Sony Pictures Entertainment Korea, Sony Pictures International Productions,