Yi Sheng is like an adult, and Li Longjiu is like a child. Look at the role positioning of this movie: a father with an IQ of only 6 years old and a lovely daughter with a IQ of 7 years old. Objectively speaking, the daughter is one year older than her father. Looking back at the beginning of the story line between Yi Sheng and his father in the movie, there is such a scene: Yi Sheng, 7 years old, sent his father out to work in the early morning, Yi Sheng handed him a water cup and told him "Don't drink tap water, drink boiled water", then squatted down and folded his father's pants, and then told him "Don't eat bread at noon, remember". This clip should impress many viewers. It explains the beautiful feelings between her daughter Yi Sheng and her father, and also explains Yi Sheng's sensible and intelligent character. In a sense, although the emotional position of this film is set on father and daughter, their feelings are sometimes misplaced. When a 7-year-old girl takes care of an adult with only 6-year-old IQ, you seem to see the considerate love between mother and son, the intimate shadow between brother and sister, or the inseparable relationship between husband and wife. Perhaps it is this emotional dislocation that makes you shed more tears when watching movies. In other words, the director also wants to express that in the face of these different emotional relationships, deep love is the same truth! This is why Yi Sheng is one year older than his father. After his father Li Longjiu was wrongly sentenced to prison, all he could think about was Yi Sheng. Knowing that Yi Sheng was waiting for him, and fearing that he was worried, I wanted to call home and let Yi Sheng know through the phone of the police station. In prison, he kept writing the name of his life in the sand and painting a picture frame of love outside the name. Yi Sheng left his whereabouts and phone number at home before being sent to an orphanage. The father and the daughter are connected and miss each other.