After getting largely unnoticed due to the "25th Golden Disk Awards" being shown at around the same time last week, "Mnet's M! Countdown" returns on December 15th with another weekly fun-filled music show, and this episode is packed with awesome performances. For today's show, IU made her comeback while Park Hyo Shin had his farewell stage. GD&TOP's comeback was teased three times for next week's show. MCD also did a special feature, comparing G-Dragon against T.O.P. about everything. Meanwhile, it was a battle between SISTAR and T-ara for the #1 spot on M! Countdown today, and in the end, it was latter who came out on top, winning for the 2nd week in a row! Congratulations to T-ara! MCD Paparazzi captured BTS of T-ara's win last week. Performers for today included T-ara, Seo In Young, Younha, Ab Avenue, Jo Moon Geun, VNT, Yang Dong Geun, Sean, Gavy NJ, F.Cuz, Sunday 2PM, and Bebe Mignon. Seo In Young - Into The Rhythm F.Cuz - Midnight Sun Younha - Take Care of My Boyfriend T-ara - Yayaya + Why Are You Being Like This VNT - Sound