Recently, rookie duo group 15& worked with nine members of Hanbit Performing Arts Company's Light Sound, a visually impaired choir group.

A staff member recently revealed on Twitter, "15& Ji Min and Ye Rin who came to our studio. And the Light Sound children. The song is daebak(Awesome)" and revealed the photo above. The staff member added, "Having filmed, recorded, and cared for the children, you guys really worked hard."

Park Ji Min replied, "Thank you for singing our song so well. It was a fun time with the dongsangs." Baek Yerin also commented, "It was a meaningful time. It was a really fun time."

In the photo above, Park Ji Min and Baek Yerin are seen standing together with the nine members of the choir. They are seen wearing shirts and skirts and having a good time while holding hands with the members.

Meanwhile, on the 3rd, Park Ji Min donated 50 million won(about $45,000 USD) to the Hanbit Performing Arts Company with the winning prize money she received from winning first on SBS' "K-Pop Star."