He truly didn't expect that the Emperor of Zhou would be so formidable... having already uncovered his identity, and even seen through the deep hatred in his heart and his desire for revenge. He thought that ever since following Bai Jinse, he had hidden it well.
Bai Jinse had done him a favor. At first, he didn't know Bai Jinse's identity. Thinking that his country was already gone, he decided to stay by Bai Jinse's side to repay her.
Later, he learned about Bai Jinse's identity, knew that she was the younger sister of Bai Qingyan, the Emperor of Zhou, and thought... if the Yan Kingdom were to ally with Zhou, staying by the Emperor's sister would surely present an opportunity to meet the Emperor of Yan and the Regent Prince, allowing him to carry out his assassination plan.
