Please answer the content of episode 20 of 1988.

In the 20th episode of 1988, Xiao Dongzi decided to leave home and go to school in winter, but Ah Fu disagreed, thinking that Xiao Dongzi was too delicate to withstand such cold weather. So Ah Fu and Xiao Dongzi played at home together. Xiao Dongzi's mother came to see them and found that they were very happy at home, so she decided to send them some food and clothes. Xiao Dongzi's mother gave Ah Fu and Xiao Dongzi each a red packet to send them to school and said that she would help them solve the problems they encountered in their studies. Ah Fu and Xiao Dongzi were extremely grateful, so they bid farewell to Xiao Dongzi's mother and went to school. On the way to school, Ah Fu thought of the good times she had spent with Xiao Dongzi and felt very nostalgic. When he arrived at Xiao Dongzi's house, he found that the door was already open and Xiao Dongzi's voice came from inside. Ah Fu went in and saw Xiao Dongzi playing. He was very happy because Xiao Dongzi had become a lot more sensible and lively.