Children's living environment and parents' role models are very important. Guo Jing's mother, Ping Li, loves and hates each other, so she has a lot of backbone. Ke Zhene and the Six Monsters are both chivalrous men. Although Huang Rong is a troublemaker, he is not a bad guy, so are Hong Qigong and the old urchin. So Guo Jing's example became a generation of heroes.
And Yang Kang? Her mother has been avoiding him, and so has his teacher Qiu Chuji. His second teacher, Mei Chaofeng, and later Ouyang Feng and others were cruel, cruel and selfish people. Yang Kang grew up in the adulterous palace, so he was far less natural than Guo Jing.
From the teacher's point of view, Qiu Chuji is only half a good man, but he is a failed teacher. So it's no wonder that the old urchin called Zhenqizi and didn't finish playing any of them. Maybe that's why.