정철
Meanwhile, the Easterners Yu Seongryong, Yi Sanhae, and Yi Seongjung and the Westerner Jeong Cheol promised each other that they would ask Seonjo to make Gwanghae Crown Prince together. However, Yi Sanhae did not appear at the promised date (he claimed he was ill). Yu Seongryong was too cautious to bring the subject up, and Jeong Cheol was the first to advise Seonjo to make Gwanghae Crown Prince. When Jeong Cheol brought the matter up, Seonjo was infuriated, believing that the story told by Lady In was true. Seonjo exiled Jeong Cheol and fired Westerners such as the Yun Dusu brothers, recreating a solidly Easterner government.