The naughty Zhang Hanyi (Park Zhibin) is a nine-year-old child who often skips class or makes trouble at school. The 12-year-old brother Han Xing (Cui Youhe is acted the role of) is a sensible and clever child, takes good care of his younger brother. Although they have different personalities, the two brothers still love each other. Unfortunately, my brother Hanxing suffered from brain cancer, and his parents were shocked and sad. The operation may also cause Korean star to go blind, and parents who deeply blame themselves feel sorry for their eldest son and are very worried about their child's future. They are all busy taking care of the sick Korean star in bed, ignoring the naughty Hanyi. Because of his parents' neglect, his brother could not accompany him, and Han Yi became even more naughty. Because his brother gave Han Yi a card to another patient, Han Yi was so angry that he was scolded by his brother and left the hospital. Han Yi suddenly became sensible, and at a time when his brother and his patient's lives were in danger, Han Yi began to do his part for his sick brother.