Qiu Wan, 28 years old, is the third-generation biofilm cultivation and control specialist at "Zuiyuefang" in Jiangnan Liquor Town. Ten years ago, she and her childhood sweetheart Xiao Yan brewed a jar of "daughter's red" together in an ancient cellar, and they agreed that the day the wine would be brewed would be a lifelong affair. Xiao Yan's family fell into disgrace and he went away to a foreign country without any news. Qiu Wan guarded the unopened jar of wine and devoted all her energy to the conservation of the biofilm, becoming the youngest conservationist in the town.
Ten years later, Xiao Yan returned as an investor in the wine industry and wanted to acquire Zuiyuefang to build an industrialized production line. On the night of their reunion, he held the jar of aged Nuerhong and said, "I'm here to marry this jar of wine, and I'm also here to marry you." But Qiu Wan was already engaged to the honest potter Zhou Ping'an - all she wanted was stability.
The story revolves around the contradiction between Qiu Wan's protection of the biofilm ecology of the ancient cellar and Xiao Yan's promotion of industrial transformation. When Xiao Yan's new temperature control equipment caused the "moon white film" that Qiu Wan had carefully cultivated for seven years to die overnight, when the pottery altar fired by Zhou Ping'an was stripped of the native bacteria due to excessive disinfection, when Qiu Wan discovered that behind Xiao Yan's return was hidden the guilt and compensation for parting without saying goodbye... A jar of good wine is nourished by an exclusive bacterial film, and a deep love is maintained by exclusive sincerity.
In the end, Qiu Wan understood: old love is like a necrotic bacterial membrane, which needs to be scraped off and reborn even if there is all kinds of reluctance to let go. She chose to guard the ancient cellar alone, but Xiao Yan gave up the acquisition, handed over the ancestral brewing secret recipe to Zuiyuefang, and left again. Leaving this time is the real fulfillment.
