Who is the girl in the black dress in Gangnam style official video around 053 - 054?

The girl in the black dress in the "Gangnam Style" official music video is HyunA, a South Korean singer and member of the girl group 4Minute. She makes a cameo appearance during the dance sequence, adding to the video's vibrant and energetic atmosphere. HyunA is well-known for her solo career and collaborations in the K-pop industry.