Wonder About Us! Hello, I'm Taekhyeon! Jeong Taekhyeon (정택현) is a South Korean rapper and singer under Management Air. He was a child actor before deciding to become an idol. He is a member of project group 1THE9.
On October 25, 2018, Jeong Taek Hyeon was introduced as a contestant of Under Nineteen with his moving poster. The poster revealed that he was a part of the rap team. He finished in fifth place, thus becoming a member of the project group 1THE9.