Liu Ertie (played by Li Xuejian), who is over 60 years old, is a retired train driver. He has the perseverance and stubbornness of people in that era, and he also has similar clumsiness and stubbornness when it comes to children. Ertie likes to drink a few sips every day, and when he is drunk, his relationship with his son is even more tense. Liu Ertie's son Haipi (played by Huang Lei) is over 31 years old and has accomplished nothing. He can only make a living by delivering express delivery. He loves to make trouble with his buddies every day. He hates his father's various things, and the communication between father and son often ends in a big quarrel. The childhood sweetheart Yi Shuang (played by Song Jia) was frustrated in her plan to go to the United States. The young people could only lick each other's wounds and comfort each other. One day, Old Liu was diagnosed with Alzheimer's disease. His memory was lost day by day, and he forgot many troubles. He only remembered his son's well-behaved appearance. The closest and most annoying person is lost in the city of memory. Can I still hold his hand?