 Its members included Kim Ok-gyun, Pak Yung-hio, Hong Yeong-sik, Seo Gwang-beom, and Soh Jaipil.The group was also very young; Pak Yung-hio came from a prestigious lineage related to the royal family, was 23, Hong was 29, Seo Gwang-beom was 25, and Soh Jaipil was 20, with Kim Ok-gyun being the oldest, at 33.All had spent some time in Japan, In 1882, Pak Yung-hio had been part of a mission sent to Japan to apologize for the Imo incident.