On 12th, live performance of Mnet 'M!Countdown' took place at CJ E&M Center located at Sangam-dong, Seoul.
Park Jung Hyun, Boom, N-Train, A-Jax, Nu'Est, Jang Wooyoung, and Big Star had their debut performance.
Afterwards, Super Junior, f(x), After School, SISTAR, ZE:A, Juniel, M.I.B, GangKidz, and RhythmPower appeared for performances.
f(x) performed their new song 'Electric Shock', and Krystal drew people's attention with her amazing abs.
On the other hand, Super Junior was ranked 1st for the week with their new track 'Sexy, Free & Single'.
