On a summer night when he was eighteen years old, a "betrayal" caused Lin Yuming to travel to a foreign country and made Xu Xingman bury his secret for twelve years.
When they reunited at the age of thirty, she was a designer who returned to China with her fiancé to hold a wedding show, and he was an astrophysicist who coldly called her "Miss Xu". He seemed to hate her, but he stayed for her again and again in the corners she couldn't see; she smiled and prepared to marry someone else, but every wedding manuscript she wrote showed him at the age of eighteen.
Together they prepared a big show called "Overdue Starlight" - they thought it was just a farewell, but they didn't know that it was a two-way, long-planned reunion.
By the time starlight arrives from billions of light-years away, the luminous star may have long since died.
This is a love that is twelve years late. To meet again is to say farewell forever.