Young-ho does not have any dreams for his life. He has been examining for three years to go into an university. He makes a decision to send out a letter to his youth good friend So-yeon. However her more youthful sister So-hee obtains the letter rather than her ill sis. So-hee composes back to Young-ho, making believe to be So-yeon. On the other hand, So-hee cares for her ill sis as well as additionally runs a previously owned book shop with her mother.