Mnet 'M Countdown' live broadcast pre-rehearsal was held at cj ENM Center in Sangam-dong, Mapo-gu, Seoul on the afternoon of November 15th.
Weki Meki (Kim Do-yeon, Ji Su-yeon, Leee, Summer savory, Lua, Leena and Lucy) attended the ceremony.
About Weki Meki
Weki Meki is a South Korean girl group formed by Fantagio in 2017. The group consists of eight members: Suyeon, Elly, Yoojung, Doyeon, Sei, Lua, Rina, and Lucy.
 Wikipedia