Rookie group�JJ Project made a big first impression earlier today with their debut performance of 'Bounce' on Mnet's M! Countdown.

In support of the group, their fellow JYP Entertainment members displayed their support on Twitter.

2PM's Taecyeon tweeted, "Good job on the first broadcast, we were all watching from Japan, we'll be looking forward to your future promotions".

2PM's Junho tweeted, "JJproject has finally debuted~^^ Even though it was their first stage they weren't nervous, great job, from now on Fighting!!"

2PM's Nichkhun tweeted, "'Bounce, Bounce, c'mon Bounce' is on repeat in my head~ They performed so well on their first stage~ They're so so good!!!! Keep it going!!! Fighting Tomorrow!!"

2PM's Junsu tweeted, "JYP's rookie JJ project had their debut stage today! Saw the performance, it was so exciting!! bounce~ bounce~ Fighting! @jbjyp @jrjypkeep goin on!!"

Wonder Girls Yenny tweeted, "JJ Daebak!!!!! B-B-Bounce! So exciting~~!!! Fighting, Jin Young and Jae Bum!!"

Miss A's Fei tweeted, "@jbjyp @jrjyp JJ - Saw your first broadcast ^^ You guys were so good on stage. I wanted to cheer you on in person... it's unfortunate T T Fighting for tomorrow, and the day after! Bounce..."

Miss A's Jia tweeted, "JJproject You debuted today!! kekeke I was overseas so I couldn't see your stage but~~ kekeke work hard! Fighting!!^^"

Miss A's Suzy tweeted, "JJ Project Saw your debut stage, It was really really awesome considering it was your debut stage. Reminds me of my debut!!!!!!! JB, Jr. Fighting, Jin Young, Jae Bum fighting!"

2AM's Seulong tweeted, "JJ's song is so good T T Bounce~~~~ Bounce~~~ Let's go!!!"

These rookies looked like veterans as they took to the stage and despite all the bouncing and shaking in the choreography, they gave a solid vocal performance.

Check out their MR Removed performance below!



[Thanks to everyone who sent this in.]