They were once the "Group of Seven" who ran fearlessly beside the railway tracks in North City.
In the increasingly colorful northern town of the late 1980s, seven young figures are closely connected: the shy and introverted Li Yu, the cute and cute Chen Ting, the talkative and handsome Yu Ze, the elf and spicy Su Su, the gentle and gentle brother-like Mu Bei, the rock and roll Nan Chu, and the straightforward and cheerful Youyou.
The abandoned railway tunnel is their medal of adventure, and the bonfire beside the river reflects their confused thoughts and vague sorrow of separation when they are about to take the high school entrance examination.
Youth whizzes by, and fate throws them on completely different trajectories.
Some people stay at home, some go to other places; some inherit the family business, and some put on white clothes.
Only Li Yu and Chen Ting, who were in love for the first time, seemed to have disappeared from the world, leaving no news at all, becoming an unsolved mystery and a secret wound in each other's hearts.
Years later, the gears of fate turned quietly in the hospital corridor.
Li Yu, who has become the helmsman of a transportation company, suddenly reunites with top neurosurgeon Chen Ting.
A belated apology opened the cracks of misunderstanding and ignited the flames of reunion.
The old friends sat around again, laughing and sighing, and time seemed to go back.
However, the road to reconciliation is not an easy one.
Li Yu's ups and downs in the shopping mall and Chen Ting's scalpel lights and shadows are intertwined with the complexity and exhaustion of the adult world.
Old feelings are surging, but new misunderstandings and tests of reality follow one after another.
Can they cross the ravine of time and heal the regrets of youth? When the "Railway Seven" each shine brightly on the stage of life, can that initial heartbeat still penetrate the fog of time and illuminate each other's future?
