Why did Guo Jing strongly oppose the marriage of Yang Guo and Xiao Longnu in "The Legend of the Condor Heroes"?

In "The Legend of the Condor Heroes", the reason why Guo Jing opposed the marriage between Yang Guo and Xiao Longnv was because Yang Guo and Xiao Longnv were known as masters and disciples. Such behavior violated the ethical etiquette. Guo Jing felt that he was sorry for doing so. Yang Kang, his younger brother, felt that he had not taught Yang Guo well. The second reason is that Guo Jing once wanted to marry his daughter Guo Fu to Yang Guo, but Guo Fu broke Yang Guo's arm and the marriage was canceled. Even so, Yang Guo should not marry his master. This is not in line with etiquette. Third, because Guo Jing's former love rival Ouyang Ke was a playboy who had a romantic affair with a female disciple. Yang Guo's behavior made Guo Jing very sad that his dearest nephew actually wanted to imitate his love rival's behavior. Guo Jing felt uncomfortable from the bottom of his heart. He felt that he had failed to educate Yang Guo well. In the future, he would be sorry for Yang Guo's parents and had no way to explain to Yang Guo's parents.

At the martial arts conference, Xiao Longnu was in the limelight, and Yang Guo also announced his marriage to Xiao Longnu, but it touched Guo Jing's sensitive nerves. Guo Jing felt that this was completely unethical, so he became furious. In fact, as Yang Guo's elder, Guo Jing must have hoped that Yang Guo could marry a woman from a good family, and Xiao Longnu was already innocent at the time. In addition, Xiao Longnu was Yang Guo's master, and Yang Guo still called her aunt. If the two get married, wouldn't it be incest, and Yang Guo's reputation would be ruined? Yang Guo's future is very bright. As a parent, I definitely hope that Yang Guo will stay clean and find a girl from a good family to live a happy life, instead of hanging out with his master and making others laugh at him. Coupled with Yang Kang's instructions to Guo Jing and Guo Jing's inner guilt for Yang Kang, he couldn't let Yang Guo go astray and would definitely oppose the marriage.

In the eyes of the ancients, etiquette is very important. It is absolutely forbidden for a master and his disciple to combine. This is against ethics and is incest. Even in the informal arena, this cannot be the case. Guo Jing is a typical patriarch. He pays more attention to etiquette and rules. Although he is informal, he would not do such a thing. He is even more strict with Yang Guo, the junior he loves, so Guo Jing becomes furious.