23-Year-old Lin Xia resigned and returned to her hometown. She only wanted to sell the "old movie studio" left by her grandmother - this old house with a special camera hidden in it. Her guilt and "conservative" misunderstanding of her grandmother had become a burden for her to escape. That brass camera was engraved with "Nian'an" and only took pictures of "regretful moments hidden by time." However, when she helped 70-year-old Grandpa Zhao take pictures of the missing train to visit relatives in 1968, and accompanied Su Xiao to see clearly the unspoken farewell on that rainy night, she was exposed to the tenderness behind the regret for the first time; when taking old photos of herself on her 18th birthday, Lin Xia saw more clearly: the birthday she thought she had forgotten, hid her grandmother's sadness...
From wanting to sell the museum to taking the initiative to protect it, Lin Xia finally understood her grandmother's rules - old memories are never a way back, but allow everyone who comes with regrets to find unseen love in the fragments of time.
The fragrance of osmanthus in Wutong Lane persists year after year. In the old movie studio, the sound of the camera shutter is still ringing, waiting for everyone who has "reconciled with regrets" and waiting for them to move toward the present with the tenderness of time...