정철
However, Yi San-hae knew that Seonjo was much closer to Prince Sinseong than to either Imhae or Gwanghae. Yi also knew that both Jeong Cheol and Yu Seong-ryong wanted Gwanghae as crown prince, and that Yu was more cautious. Yi San-hae so decided to bring down Jeong Cheol and the Westerners by telling Lady In, Prince Sinseong's mother, that Jeong was planning to kill her and Sinseong after he had made Gwanghae the Crown Prince.