이이
The Easterner government of the 1580s are often accused of increasing the damage caused by the Imjin War in the 1590s. Though controversial, mainstream historians generally believe that Yi I advised the king to prepare 100,000 soldiers against possible foreign invasions. However, this was refused by Yu Seongryong, a major leader of the Easterners, because Yu believed that raising a large army would be harsh on the populace. However, Yi's worries were exemplified in 1592, when 200,000 Japanese soldiers invaded Busan. However, there is a theory that the advice was in fact a forgery invented by Yi's pupil Kim Jang-Saeng to make Yi I look wiser and to make Yu Seongryong look foolish.