When Ye Beiming was still a child, because of his blindness, he was neglected by his father. He diligently learned the lute, heeding Empress Li's words, in hopes of receiving a sliver of affection.
After Empress Li died, he learned that he was Hei Yao's son, which led to a dramatic change in his temperament, and he secluded himself in the Cold Palace for a time.
Subsequently, he resolved to avenge Empress Li. He began to take over the powers Empress Li had left behind early on and further expanded them.
He forced Emperor Ye Chengtian to abdicate and ultimately became the Regent King of Great Zhou. He clashed with Hei Yao multiple times, all because he wanted to avenge his "mother," Empress Li.
But in the end, all of this was completely baseless.
Whether it was Ye Chengtian, Hei Yao, or the woman before him, none had any connection to him.
All he had done over the years was simply a joke.
