This paper sheds light on the conflict among the Joseon government, the expeditionary force of the Ming, and the Ming government during the days of peace negotiation amid the Imjin War. In April 1593 the Ming forces and its Japanese counterpart entered into full-scale peace negotiation. Due to the huge gulf between the two on the terms of peace, however, difficulties ensued. The internecine struggle within the Ming government was another obstacle, where the officials were divided into pros and cons of the negotiation itself. Meanwhile, the Ming forces concealed the true picture of battlegrounds from Beijing government : Joseon government strived to let the Beijing government know of the ‘actual’ process of the peace negotiation. Ming forces blocked the mission sent from the Joseon government, which was heading for Beijing. This struggles led to manifold conflict. Joseon’s continued attempts to reveal the reality exacerbated the discord, resulting in a series of replacements in the Ming forces’ high command. Faced with the consistent pressure of the Ming forces, however, Joseon government had no choice but to request the investiture (?封) of Toyotomi Hideyoshi Japan to the Ming government. Concerned with the possibility that excessive resistance might render her own position precarious, Joseon made the decision aforementioned. The conflict made the connection of interests among the individual subjects obvious ; Joseon and Ming could better understand the political structure and the way of decision making of each other. Simultaneously, however, mutual distrust was deepened. Such being the case, political disputes had influence on the peace negotiation. Negotiations reached impasse and unexpected situations followed. Structure of conflict during this period of peace negotiation lingered on well into the late 1590s, the time period when the peace negotiation broke down and another war broke out and ceased.