Cheng Hao
At that time, Gim Yuk was a boy of literature. When he was 12 years old, he wrote some essays and biographies of famous pundits. While he was reading the "Learning for Minors" (소학, 小學). he was quite impressed by the words of Cheng Hao (程顥), "Whoever starts as a public official has an earnest mind to love the objects can help people." He bore in mind that only a public official can help people to live well.