A good and simple personality is given by the family in most cases. After all, family education comes first. Gu Yaodong grew up in a good family environment, so he didn't have to worry about not having enough to eat and not being warm, and his parents loved him, so he grew up in a healthier environment. The educational concept given to him by his parents is kindness and trying to help others as much as possible, which also makes him a simple character.
Secondly, in Hidden and Great, in troubled times, Gu Yaodong is so simple because he has never endured the bitterness in society and has always maintained a simple character.
Gu Yaodong had been studying before he worked in the police station, so he never lived in society. He spends most of his time studying at school, which is basically a relatively simple place and the people he gets along with are relatively simple, so his simple personality is also caused by school life and education. In addition, Gu Yaodong himself has never been violated or beaten by society, so he deeply believes that society can be changed and has always faced many things with a simple heart.
Third, in "Hidden Greatness", in troubled times, Gu Yaodong is still so simple, because he has received higher education and he also believes that he can protect the people.
Gu Yaodong has a high academic background. His educational philosophy is to help others and protect ordinary people through the power of the police. He is well aware of the importance of his post. Under the protection of the captain and leader of the police station, Gu Yaodong has never experienced a big storm and has always been in a protected state. Coupled with Gu Yaodong's kindness, no one can easily change it, which makes his simple character more obvious.