After summer vacation, So-ri transfers to a new school and finds an anonymous letter in her desk drawer with an introduction to the school and a clue to finding the next letter. "If you want to keep reading, find my second letter!" While following the clues in the letters and searching all over the school like on a treasure hunt, So-ri keeps running into a same-aged student named Dong-soon. So-ri and Dong-soon quickly become friends as they search for the letters together. As she finds one letter after another, the special connection continues, and So-ri's curiosity grows for the mysterious sender. "I want to find the last letter and thank you in person."
Cast
Lee Soo-hyun
Lee So-ri (voice)
Kim Min-ju
Park Dong-soon (voice)
Min Seung-woo
Jung Ho-yeon (voice)
Nam Doh-hyeong
Ahn Seung-kyu (voice)
Kim Yeon-woo
Kim Ji-min (voice)
Lee Mi-na
Kim Sunny / Lee Su-kyung (voice)
Kim Chae-rin
Cho Ho-ran (voice)
Kim Yea-lim
Yang Song-hee (voice)
Kim A-rong
Young Lee So-ri (voice)
Lee Serena
Young Jung Ho-yeon (voice)
Park Ki-wook
Lee So-ri's Father (voice)
Kim Soon-mi
Doctor (voice)
Kim Hyeon-uk
Jersey (voice)
Won Jong-jun
Mask (voice)
Choi Hyun-sik
Bully from Hanwol Middle School (voice)
Crew
Kim Yong-hwan
Director, Adaptation
Jeong Eun-kyeong
Writer
Cho A-ra
Adaptation
Park Noo-ri
Adaptation
Oh Min-kyo
Editor, Assistant Director
Oh Ju-yeon
Director of Photography
Kim Jong-ryul
Executive Producer
Choi Jun
Producer
Kwon Michelle
Producer
Kim Suk-won
Sound Supervisor
Kim Tae-seong
Original Music Composer
Kim Yeon-jeong
Original Music Composer
Lee Soo-hyun
Theme Song Performance
Cho Hyeon-a
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