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.

Endless Rain

During the Japanese colonial rule of Korea, while people are in despair, Jae-ho tries to raise morale by winning cycle championship. Bok-dong, who started cycling with Jae-ho just to make a forture, becomes a symbol of hope for Koreans by defeating Japanese cyclists.