- HD 1080
- Runtime: 117m.
- Status: Released
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- Languages: ko
- Country: South Korea, United States of America
- Director: Cho Jin-mo
- Stars: Kang Ha-neul, Chun Woo-hee, Kang So-ra, Lee Sul, Lim Ju-hwan
- keywords: college, letter, young man, childhood friends, life, secondhand bookstore
- Production_studio: Azit Film, Kidari ENT, Sony Pictures Entertainment Korea, Sony Pictures International Productions, Columbia Pictures
- Slogan: A letter that started by chance, Endless Rain.
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.