Jeong Cheol
However, Yi Sanhae knew that Seonjo was much closer to Lady In of the Suwon Gim clan and her eldest son, Prince Sinseong, than to either Imhae or Gwanghae. Yi also knew that both Jeong Cheol and Yu Seongryong wanted Gwanghae as crown prince. Finally, Yi was also aware that Yu had a cautious nature, while Jeong did not.