The story begins with Xiaomei being hospitalized. She takes medication every day and feels bored, homesick, and misses her friends. Mom and the doctor have been comforting her, and it was at this moment that she and the little girl in the same room, Yaya, became good friends. One day, my mother brought them some sugar to eat and said that they would be discharged after the sugar was finished. The two little girls are very happy and looking forward to the day of discharge as soon as possible. However, after finishing the sugar, they still couldn't be discharged from the hospital. When he was feeling frustrated, the doctor came up with a solution and agreed with them: when the sugar in the jar was filled, he would be discharged from the hospital. In this way, the two little girls were reluctant to eat every day and put away the sugar. Unexpectedly, Xiaomei could be discharged before the sugar jar was full, but Yaya still needed further treatment... Xiaomei and Yaya were reluctant to part, and they also made an agreement - they would play together again when Yaya was ready.