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.

• Azit Film
• Kidari ENT
• Kang Ha-neul
• Chun Woo-hee
• Kang So-ra
• Lee Sul
• Lim Ju-hwan
• Lee Hang-na
• Lee Yang-hee
• Park Se-hyun