What is the main point of the movie "That Mountain, That Man and That Dog"?

My father is a rural postman. He has been delivering letters in the mountains all his life and will retire today. The son took over as the postman, and he also took the mountain road that his father had taken. Today is his first day in office. The father tidied up his son's package again and reminded him, but his son didn't listen attentively. Time to hit the road. The yellow dog "second child" who has been delivering letters with his father all the year round refused to go with his son. His father decided to go with his son. My son is a little worried: who listens to whom at work?

The mountain road is winding, the morning mist is long, and the second child runs ahead. His son gradually felt the weight of the parcel on his shoulder. What makes him even more embarrassed is that he doesn't know what to say to his father. His father is not at home all the year round, and he is seldom called "dad" when he is older. The two men twisted uncomfortably for a while and then rested. The son asked his father to go back, and they were lovers.

When he finally entered the village, his son was a little excited because his father said that the villagers could not see the county magistrate for several days, but it was not without him. However, the warm scene that my son expected did not appear. Everyone is used to their arrival. Walking into the empty village Committee, my son was a little depressed, but when he left, he was unexpectedly shaken.

My son sang as he walked. Father always reminds him to watch his step. At the end of another village, my father turned down a path and came to Wupo's home where she lived alone, and sent her a "letter". Wupo can't see. But waiting for a letter from her grandson who works outside every day, her father comforted her in this special way. The father asked his son to do the same in the future, but the son thought that the grandson of Wupo should do his duty. Father thinks his son is different from when he was young.

When night fell, the father and son came to Dong's cottage and caught up with a lively Dong's wedding. Father was drunk, remembering that when he was a child, his son was intoxicated by the laughter of Dong girls.

In order to cross the stream, the father reminded his son to stand firm on the mossy stone. The son refused to let his father go into the water again and insisted on carrying him across the river. In the rushing stream, the distance between two people suddenly disappeared, and almost at the same time, I felt the meaning of each other to myself and felt many things accumulated in my heart for many years.

Although the father and son still have different views on some issues, the topic seems to be a little too much, when the son talks about his mother always living on the alert. He found the expression of his father's affection, and in the yearning for the same woman, the feelings of father and son were silently communicated.

The wind is blowing and the mountain road is rugged. The transfer boy who is studying by correspondence is waiting on the slope on time. His father told him that his son will climb the mountain in the future. Don't wait any longer, Brick said. You roll down the mountain for us once, and you can't let your son roll down the mountain for us again. At this time, the son really realized what kind of road his father had taken in his life.

In order to give his father a rest, his son decided to go to the microwave station alone. Just as he was sorting out the mail, several letters were blown away by the wind, and his father jumped up at once, and his penis jumped up at the crucial moment. ...

On the last night in the mountains, my son confessed some family things to his father. The father found that his son was actually very mature.

Far away, I saw my mother's familiar figure waiting by the bridge, but their mood was different from before.

It's another morning in the mountains. My son woke up in a conversation with his parents. His father's heart touched him and urged him to continue on his way.