Was the Emperor so biased towards his two sons?
Several months ago, Wu Jinhai came to him with Bai Chen, and the two of them openly showed their relationship to the Emperor. At that time, Wu Shun could easily accept their relationship, and he even encouraged Wu Jinhai to remain loyal to Bai Chen.
It was true that Bai Chen could easily get Wu Shun's acceptance, but the situation was different now when Wu Jingguo insisted on saying that he was in love with Yu Ming. Perhaps the Emperor even thought that it was Yu Ming who was a bad influence, but before the Emperor could say that openly, Wu Jingguo first stated that it was not Yu Ming who had influenced him. Instead, he only discovered his true self after getting closer to Yu Ming.