Lin Yi's high school was filled with mathematical formulas and Shen Chen's name. She was terrible at math, but she was placed next to Shen Chen, who was number one in her grade. He was cold and taciturn, but would patiently explain every wrong question to her and write down small pieces of encouragement on scratch paper, allowing her to find the glimmer of heartbeat in the obscure functions.
She carefully treasured this love and followed his footsteps to catch up, thinking that as long as she got close enough, she would be able to wait for a result. But in Chen Chen's world, there were more distant goals and unspoken concerns. His gentleness and restraint eventually became the longest blank space in her youth.
After the college entrance examination, they rushed to different cities, like two intersecting lines. Once they miss the intersection, they can only drift apart. Lin Yi slowly healed over time and learned to let go of the boy who had occupied her entire youth; while her best friend Wen Ran and Shen Chen's good friend Jiang Wen slowly grew closer over the years, from teasing each other to staying together.
Reunited many years later, Shen Chen already had someone to spend his whole life with, and Lin Yi was finally able to say "Long time no see" to him with a smile. Those unspoken confessions and unrealized expectations eventually became the most regrettable but also the best memories of youth.
Concept: Regret in youth