
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
Young-ho

Chun Woo-hee
So-hee

Kang So-ra
Soo-jin

Lee Sul
So-yeon

Lim Ju-hwan
Young-hwan

Lee Hang-na
Mother

Lee Yang-hee
Father

Park Se-hyun
Student

Lee Ye-hwan
재수학원생들

Kim Sung-kyun
Teacher

Ko Gun-han
Jong-guk

Nam Hyeon-woo
Student

Kim Min-seo
Student

Kang Young-suk
Book Worm

Choi Myeong-bin
Young So-hee
Won Ji-u
Young So-yeon

Go Woo-rim
Young Young-ho

Lee Tae-young
Teaching Assistants

Woo Jeong-won
Teacher
Crew

Cho Jin-mo
Director
Yu Seong-hyeob
Writer

Kim Sang-bum
Editor
Kim Ho-bin
Assistant Editor
Yoo Il-seung
Director of Photography
Park Hyun-jin
Senior Colorist
Hwang Keun-ha
Executive Producer
Lee Jin-sung
Producer
Kim Hyeon-ok
Production Design
Kim Jung-won
Costume Design
Lee Seo-jin
Makeup & Hair
Shon Yong-ik
Production Sound Mixer
Gong Tae-won
Sound
You Seok-moon
Lighting Director
Yoon Dae-won
Special Effects Supervisor
Kim Dae-jun
VFX Supervisor
Kim Jung-min
VFX Supervisor
Han Jae-ho
Visual Effects
Kim Jun-seok
Music
Jin Hoon
Props
Lee Seok-jae
Props
Park Beom-jun
Key Grip
Yeom Jin
Art Direction
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