Yi was born as a love child of Jinsa Yi Ban-Oh. As his family was prominent in
Hamhung, Yi was able to receive education of sinology, however it was impossible for him to overcome the restrictions of class. Yi wanted to attend the military examination of
Gwageo and become a military officer. But, he started his study for diseases as he often suffered from inveterate illness. ==Choronology of Yi Je-ma==