"TOgether as one! Hello, I'm Chihoon!
Choi Chihoon (최치훈), also known as Ian, is a South Korean rapper, singer, and songwriter under WAKEONE. Chihoon is a former member of the boy group TO1. He first appeared in survival program World Klass where he finished eighth place, allowing him to debut as a member of the boy group TO1.
Chihoon debuted as a member of TO1 on April 1, 2020 with their first mini album Reason for Being : Benevolence.
On April 30, 2022 Wake One Entertainment released an official statement via TO1's fan cafe, announcing member Chihoon's departure from the group.