After Wihwado-hoegun，Li Chenggui’s force was growing and to threaten the Koryo regime seriously. Lee Se support Chang King to accede the throne，and went to Ming Dynasty for tributary as an envoy. His real purpose was to get the help from Ming Dynasty to suppress Li Chenggui’s force and continue Koryo regime. But Lee Se did not understand that Chu Yuan-chang actually implemented non-interference policy，he didn’t want to intervene in other countries’ internal affairs. This led to the failure of Lee Se’s mission，and ended the hope of continuing Koryo regime.