Since Goryeo rejected his demand for the opening of trading posts on the border , he invaded Goryeo many times .
In 1222 Puxian Wannu revolted against the Mongol Empire yet again while Genghis Khan made an expedition toward the west .
Since Goryeo rejected Puxian Wannu 's demand for the opening of trading posts on the border , Puxian Wannu invaded Goryeo many times .
In 1222 Puxian Wannu revolted against the Mongol Empire yet again while Genghis Khan made an expedition toward the west .