Yeo Chang Gu, known professionally as Yeo One, is a South Korean singer, dancer and member of PENTAGON (펜타곤). He graduated from Baekam High School and later obtained a degree in Performing Arts from Chungbu University. He participated in Mnet's survival show "Pentagon Maker" and was chosen as one of the original 7 members of the new boy group to be managed by CUBE Entertainment (큐브엔터테인먼트). He made his debut in October 2016 as PENTAGON's lead vocalist with their self-titled debut EP. He also began modeling with labelmate HyunA and bandmate Hongseok. In October 2023, the agency announced his contract had ended and was not renewed. He left CUBE but remains part of PENTAGON. He enlisted for his mandatory military service on May 28, 2024, and is scheduled to be discharged on November 27, 2025. (Source: MyDramaList) Watch drama online for free.