Wonder About Us! Hello, I'm Doyum! Jeon Do Yum (전도염) is a South Korean dancer, rapper, and singer under Play M Entertainment. He is a member of the project group 1THE9, as well as 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.