Mnet M Countdown' live broadcast preview was held at Sangam-dong CJ ENM Center in Mapo-gu, Seoul on the afternoon of January 17th.
Apink (Park Chan-long, Yun Bo-mi, Jung Eun-ji, Son Na-eun, Kim Nam-ju and Oh Ha-young) attended the ceremony.
About Jung Eun-ji
Jeong Eun-ji, better known mononymously as Eunji, is a South Korean singer, songwriter, actress, radio DJ, musical actress, and voice actress. She is best known as a member of the South Korean girl group Apink. Jeong made her acting debut in the coming-of-age drama, Reply 1997 in 2012.
 Wikipedia