The two secret letters were written by Xu Pingfeng, the king of North Town. Xu Pingfeng, the Lord of Northern Battlefront, was a powerful figure in the Great Feng Dynasty and the ultimate villain of the book. In the novel, Xu Pingfeng, the king of North Town, and Xu Qi 'an, the emperor of Dafeng, had a feud of killing their brother. When Xu Pingfeng was about to leave the capital, he sent secret letters to King Zhennan, the Gu God of the Southern Border, the generals of the Dafeng army, the regent, the Left Minister, and the Right Minister in the name of the Emperor of Dafeng, causing Xu Qi 'an to fall into a passive situation. While waiting for the TV series, you can also click on the link below to read the classic original work of "Dafeng Nightwatchman"!