Question: The confucian academy, Dosan Seowan, located in the East Asian country bordered by China to the northwest and Russia to the northeast, was founded by two prominant Confucian scholars, one being known as Yi Yulgok. What was the "pen" name of the other founding scholar?
Sentence (from "Yi Hwang"): A key figure of the Neo-Confucian literati, he established the Yeongnam School and set up the Dosan Seowon, a private Confucian academy.
Relevant evidence: Yes