OKDAL consists of two friends, Kim Yun-ju and Bak Se-jin who are the same age. They write their own songs and sing them. They have released two albums, including 28 that has the song, "Well Done, Today Also," and many other EP albums as well as singles and albums. "Still a Child" is a song that commemorates the duo's ten-year anniversary. They have been active as the DJs of the radio program "OKDAL and the Blue Night" for a long time. They've also done much volunteer work in Zambia, Haiti, and other countries and are carrying on their charity donations and sharing program for the children from low-income households, and providing meals to the poor elderly.