정철
Meanwhile, the Easterners Yu Seong-ryong, Yi San-hae, and the Westerner Jeong Cheol promised each other that they would ask Seonjo to make Gwanghae Crown Prince together. However, Yi did not appear at the promised date (he claimed he was ill). The less-cautious Jeong Cheol was the first to advise Seonjo to make Gwanghae Crown Prince, and Seonjo was infuriated, believing that the story told by Lady In was true. Seonjo exiled Jeong Cheol and other Westerners recreating an Easterner government. Around this time, the Easterners split into two, the Southerners and the Northerners.