Girl's Day unveiled the story behind all the bruises on their bodies.

On February 15th, MBC's "Human Documentary - Good People" visited Girl's Day in their waiting room of a music show.

The crew went to Minah while she was getting ready for their performance. She then showed the bruises on her legs and said,"There's a part in the choreography when we have to kneel down. If we don't get it right then we will end up having all of these. I don't know why I always get it wrong and get the bruises every time"

Not only Minah but Yura also suffered from having the bruises. The crew said it's a sign of their efforts but she denied and said,"It's a sign of mistakes. If it was effort then it would look different"

Minah then added,"When we come out with the new song next time, we will have bruises on the other parts of our bodies. It has always been like that"