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. 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.

Genres

Cast

Lee Su-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)

Kim A-rong

Young Lee So-ri (voice)

Kim Hyeon-uk

Jersey (voice)