First Sino-Japanese War
Gapsin Coup

In the two years preceding the Imo incident, the members of the Gaehwadang had failed to secure appointments to vital offices in the government and were unable to implement their reform plans. As a consequence they were prepared to seize power by any means necessary. In 1884, an opportunity to seize power by staging a coup d'état against the Sadaedang presented itself. In August, as hostilities between France and China erupted over Annam, half of the Chinese troops stationed in Korea were withdrawn. On December 4, 1884, with the help of Japanese minister Takezoe Shinichiro who promised to mobilize Japanese legation guards to provide assistance, the reformers staged their coup under the guise of a banquet hosted by Hong Yeong-sik, the director of the General Postal Administration. The banquet was to celebrate the opening of the new national post office. King Gojong was expected to attend together with several foreign diplomats and high-ranking officials, most of whom were members of the pro-Chinese Sadaedang faction. Kim Ok-gyun and his comrades approached King Gojong falsely stating that Chinese troops had created a disturbance and escorted him to the small Gyoengu Palace, where they placed him in the custody of Japanese legation guards. They then proceeded to kill and wound several senior officials of the Sadaedang faction.

After the coup, the Gaehwadang members formed a new government and devised a program of reform. The radical 14-point reform proposal stated that the following conditions be met: an end to Korea's tributary relationship with China; the abolition of ruling-class privilege and the establishment of equal rights for all; the reorganization of the government as virtually a constitutional monarchy; the revision of land tax laws; cancellation of the grain loan system; the unification of all internal fiscal administrations under the jurisdiction of the Ho-jo; the suppression of privileged merchants and the development of free commerce and trade, the creation of a modern police system including police patrols and royal guards; and severe punishment of corrupt officials.

However, the new government lasted no longer than a few days. This was possibly inevitable, as the reformers were supported by no more than 140 Japanese troops who faced at least 1,500 Chinese garrisoned in Seoul, under the command of General Yuan Shikai. With the reform measures being a threat to her clan's power, Queen Min secretly requested military intervention from the Chinese. Consequently, within three days, even before the reform measures were made public, the coup was suppressed by Chinese troops who attacked and defeated the Japanese forces and restored power to the pro-Chinese Sadaedang faction. During the ensuing melee Hong Yeong-sik was killed, the Japanese legation building was burned down and forty Japanese were killed. The surviving Korean coup leaders including Kim Ok-gyun escaped to the port of Chemulpo under escort of the Japanese minister Takezoe. From there they boarded a Japanese ship for exile in Japan.

In January 1885, with a show of force the Japanese dispatched two battalions and seven warships to Korea, which resulted in the Japan–Korea Treaty of 1885, signed on 9 January 1885. The treaty restored diplomatic relations between Japan and Korea. The Koreans also agreed to pay the Japanese ¥ 100,000 for damages to their legation and to provide a site for the building of a new legation. Prime Minister Ito Hirobumi, in order to overcome Japan's disadvantageous position in Korea followed by the abortive coup, visited China to discuss the matter with his Chinese counterpart, Li Hongzhang. The two parties succeeded in concluding the Convention of Tianjin on May 31, 1885. They also pledged to withdraw their troops from Korea within four months, with prior notification to the other if troops were to be sent to Korea in the future. After both countries withdrew their forces they left behind a precarious balance of power on the Korean Peninsula between the two nations. Meanwhile, Yuan Shikai remained in Seoul, appointed as the Chinese Resident, and continued to interfere with Korean domestic politics. The failure of the coup also marked a dramatic decline in Japanese influence over Korea.
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