Overview
All Yuan Zhinan has left behind when she passed away is a letter and an invitation to a school reunion. Attending the reunion in lieu of her late elder sister, Zhihua accidentally runs into Yin Chuan, on whom she had a crush in her youth. As old memories are evoked, and correspondences travel through different contexts and times, Zhihua slowly uncovers the intricate story of the trio.
| Actor | Age then | Age now | |
|---|---|---|---|
 | 44 | 50 | |
 | 40 | 47 | |
 | 33 | 40 | |
 | 17 | 24 | |
 | 13 | 20 | |
 | 15 | 22 | |
 | 80 | 86 | |
 | 35 | 41 | |
 | 36 | 42 | |
 | 17 | 23 |