"Hyo-gwan Bag

Pen name, Un-e or Cloud Slope. Opera singer at the time of
King Czôl-zong and King Go-zong. Gained a good reputation
among the people, but dreamed his life away. The famous
anthology of poems named Gagog-wônlyu or the Original
Streams of Songs, which he edited in the 13th year of King
Go-zong being helped by his student Min-yông An is the
collection of Sizos in chronological order, and classified
them into two kinds, Male Voice and Female Voice accord-
ing to the tunes." --op cit