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.

Based on an original written by Cheon Myeong-gwan, a 48 year-old movie director moves into the house where his mother and 50 year-old brother lives until his sister moves in with her niece.