Mujin

When Sun to search for Changge and ventures to discover his origin, Mujin stays behind in Sun's Khagnate to administer any responsibilities on his behalf. However, after Sun's discovery of his Khitan origin, the Great Khan sends them on suicide mission against the Uyghurs to challenge his loyalty. To protect Mujin, Sun sends him back to inform the Great Khan about She'ers coup attempt while he strikes a truce deal with Pusa. Much to his reluctance, Mujin agrees to return but swears that if Sun does not safely come back in time, he will risk his life on a revenge battle on the Great Khan's army.