One day, 25 years ago, missing Chun-bae's letter is delivered to his cousin, Jjang-goo. The letter contains Chun-bae's lover, Bok-soon, and other people's letters. Jjang-goo finds Bok-soon to deliver the letter and meets class president Jang together. The three people recall their memories from 25 years ago, and eventually faced the person who sent the letter. Through that, the tangles begin to unravel.
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Seo Hyun-woo
Jjang-gu
Han Sa-myeong
Choon-bae
Seo Jin-won
Detective Cha
Yoo Ji-yeon
Bok-soon
KD
Kim Dae-jin
Chief Jang
IH
Im Ho-kyoung
Teacher Kim
NS
No Si-hong
Yoon-bae
Jo Young-ji
Young Ok-hee
LG
Lee Geun-hu
Chief inspector
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