An argument erupts when a woman confronts her Granny after an expert declares Granny's pendant fake. Granny insists the pendant she owns is real and the Palace Museum's version is fake; police earlier flagged Granny for mental issues. To avoid upsetting her, the woman accepts the pendant as a gift and suggests taking it to Regal Vault — an auction house where she once stored treasures and where even cheap items fetch tens of millions — to verify its value. The family worries Granny's condition is worsening, and everyone is left asking: has Granny been telling the truth?