"Everyone has their uses. Don't underestimate anyone," Zhang Fan's father had told him when he was young. His father was the cautious type who had worked hard at a factory for his whole life. In the end, Zhang Fan's father had never even managed to receive medical insurance, so maybe his words wouldn't seem like much. He had nothing at all to give his son apart from some words of wisdom.
Be kind to others, no need to compete with others, watch your own words, don't argue with others needlessly, and so on. These were all just things commonly taught in many families. Zhang Fan's parents only wanted for him to happily live his life rather than be highly successful no matter what. This was quite a plain worldview. Back before Zhang Fan attended college, he had really looked down upon such a way of thinking.