Crayon Pop performed 'Bar Bar Bar' at Busan Paik Hospital to cheer up the patients during the Chuseok holiday.

The girls showed happy, cheerful smiles as they had fun dancing and singing in accompaniment to the patients' fan chants. They even tried to interact with the viewers by shaking their hands whenever the choreography allowed them to close the distance.

They really seem to have brightened up the day for everyone in Busan Paik Hospital. Check out the video above to see their performance!

SEE ALSO: Some of your favorite idol groups wish you a happy Chuseok through special greetings videos