Screenwriter Cheng An'an has her script stolen by colleague Zhang Kai, and meanwhile, her grandmother Chen Guiying goes missing due to Alzheimer's disease. After returning to her hometown, she discovers the university admission letter cassette and copper key treasured by her grandmother, uncovering a family secret sealed for thirty years: her uncle hid her mother's college admission letter, and her grandmother took the blame to protect her children. Though her memory is retreating, Grandma always remembers to leave a lamp for her daughter. Cheng An'an writes this true past into a script, using warmth to fight against forgetting, ultimately helping her mother reconcile with her grandmother while guarding her own original aspiration for creation.