Today on KBS "Music Bank," Groups Girls' Generation and CNBLUE were battling against each other for first place.

Both groups promised that if the other team won, the losing team would perform push ups.

Girls' Generation member Yoona then asked CNBLUE what they thought they could do better than Girls' Generation.

CNBLUE replied by singing a masculine version of "I Got a Boy."

Girls' Generation responded right back by singing a feminine version of "I'm Sorry."

Watch the video below: