집현전
In 1434, the 16th year of Sejong the Great's reign, as he passed "gwageo" or civil minister exam, with the highest point, he was appointed as the title of Buchucan (副修撰) at Hall of Worthies (Jiphyeonjeon). He participated in helping the king create hangul, Korean alphabet. He also devoted to compiling "Dongguk Tonggam" and "Gyeongguk daejeon" (Code of Law).