Wonder About Us! Hello, I'm Doyum!
Dy, also known as Jeon Do Yum (전도염), is a South Korean dancer, rapper, and singer. He is currently a member of boy group "Just B" under Bluedot Entertainment. He used to be a member of the now-disbanded project group 1THE9, as well as former trainee group PlayM BOYS.
On October 25, 2018, Jeon Do Yum was introduced as a contestant of Under Nineteen with his moving poster. The poster revealed that he was a part of the performance team. He finished in first place, thus becoming a member and the center of the project group 1THE9.