Emperor of South Yue/Spoilers

History
The Emperor adored Empress Ming way more than any of his other wives. However, he was not able to stand up against the Imperial Empress when she had Empress Ming placed under house arrest. He seemed to be unaware of the treatment of his most favored concubine, but later he states that the Imperial Empress was responsible for her death; thus, he likely knew something but either didn't care enough or - more likely - was under political pressure to do nothing.

Peach Blossom Banquet
Ai Jia opposes the marriage of Bai Ruo Qi and Li Mo Jun and instead suggest to follow the promise made to Bai Liu Feng to have Li Mo Jun marry Bai Ruo Li. The Imperial Empress and Imperial Tutor remind the Emperor that he only promised to wed his "strongest son" to the "strongest woman" when Madam Bai (Bai Liu Feng's wife) was pregnant with Bai Ruo Li. It was strongly implied that this abstract lady would be Bai Liu Feng's daughter. He listens to this argument and decides to move forward with the engagement.

When Huang Yue Li and Li Mo Ying reveal their power, he changes the engagement to them. When he learn about Huang Yue Li's treatment he severely reprimands Bai Liu Jing in front of the Court.

South Yue (Part 2)
The Emperor is very angry when Li Xue'er comes back in a carriage full of men in the throws of an orgy. He revokes her Princess status, but they hide her indiscretion by refusing to talk about it and killing all the guards that saw what happened.

When the Treasury collapses, the Emperor calls Huang Yue Li and Mo Yi to the Palace. First, the Empress tries to blame what happened to Li Xue'er, but since the Emperor refuses to allow anyone to talk about what happened she not only gets away unscathed, but also makes a compelling argument for 3,000 gold to replace the Array materials. Seeing the Empress's plan failed, the Imperial Tutor blames Huang Yue Li. The Emperor cannot understand how a young woman with no access to the plans and (as he is unaware) not an Armament Master could have known the top secrete Implosion Mechanism. Thus, Huang Yue Li's is able to implicate the Imperial Tutor and Li Mo Jun of Treason. The emperor is so angry that the Crown Prince's title and the Imperial Empress's title are revoked.