Lead vocalist and main dancer of the South Korean K-pop group Red Velvet. She has appeared on television shows such as Let's Go! Dream Team, The Last Song and Off to School. She was a member of the pre-debut group S.M. Rookies and performed a Christmas carol which was posted to the group's YouTube channel. She trained for seven years with S.M., beginning when she was cast in 2007. She played the lead role of Dorothy in a S.M. Entertainment production of the musical School Oz in January of 2015. Her Korean name is Kang Seul-gi and she was born in Ansan, Gyeonggi-do, South Korea. She made an appearance in the Henry Lau music video for his song "Fantastic," and was also featured on his song "Butterfly." [+]