What was the most prominent way of portraying the characters in 'Back'?

"Back" was an essay written by Zhu Ziqing, which deeply expressed the greatness of a father's love and the tenderness of a father by describing the story between a father and his son. Among them, the most prominent way to portray a character was to describe the details. The article portrayed his father's image very deeply by describing his father's words and deeds. For example, in the article, the author described in detail the expression, actions, and words of the father when he saw his son off at the station, so that the readers could deeply feel the greatness of fatherly love and the tenderness of a father. The article also described the son's attachment and longing for his father, showing the son's inner contradictions and pain, so that the readers could deeply understand the son's gratitude and nostalgia for his father's love. Through the detailed description, the author successfully portrayed the two characters of father and son, so that the readers had a deep impression of these two characters and could feel their emotional changes and behavior details.