Please answer the following question: Pick one category for the following text. The options are - company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work. Ryu Sera -  Ryu Sera (Korean: 류세라); born September 3 1987) is a South Korean idol singer dancer and model. She is the main vocalist of the South Korean girl group Nine Muses. She is one of the original line-up of Nine Muses and debuted with the group in August 2010. She was born in Toronto Canada. She has one younger brother.
A:
Artist