Hong Yeong-sik
Radical reformer and head of the Post Office, at whose opening banquet the Gapsin Coup began; he was killed when the coup failed
As a commissioner on the 1881 inspection mission he studied the Japanese army, and in 1883 he went to the United States as deputy head of the Bobingsa mission. In 1884 he became head of the new Post Office, and at its opening banquet that year he launched the Gapsin Coup with Kim Ok-gyun, Park Yeong-hyo and others. When the coup collapsed after three days he stayed with Gojong to the end and was killed by Qing soldiers.

