At the funeral of her husband, grandma Xiu-ying does not look upset and even hangs out with her childhood sweetheart, Chi, like a happy girl. Astonished by her behavior, her grandson Yu-chen and his pregnant wife Jie-ru worry about her and bring her back to Taipei. After living together, they find Xiu-ying’s memory and behavior even more strange, and she is eventually diagnosed with dementia. The doctor explains that Xiu-ying may fall into past memories at any time, so if they want to understand how to manage Xiu-ying’ fear and aggression, they need to know more about her relationship with her husband or other men. However, as Yu-chen and Jie-ru build their new life and try to understand more about grandma, Xiu-ying attacks her caretaker and insists that only Chi keep her company…