Chief inspector
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.
Jeon Gwang-sik
Hye-jeong, a lonely young girl who has drifted away from her family and avoids personal relationships, works in a factory, lives in a shared apartment, and leads an insipid and meaningless existence until one night she discovers that she has become a ghost.
