From U-TUBE:EVERGLOW - 'Don't Speak' Christmas PerformanceEVERGLOW is a girl group under Yuehua Entertainment. There are six members: Sihyeon, E:U, Mia, Onda, Aisha and Yiren. They debuted on March 18, 2019.
http://www.nicovideo.jp/watch/sm39802564