Lee Chang Sub is a South Korean singer. He is a member of the boyband BtoB, which debuted in 2012. He studied Practical Music at Howon University. Prior to his debut as an idol, he won a Daesang at the 16th Suwon Music Festival 2008 and even became vice president of Red Cross Youth Gyeonggi Province in 2009. He enlisted for his mandatory military service on January 14, 2019. He was discharged on August 21, 2020. On November 6, 2023, he left Cube Entertainment, and on November 22nd, he signed with Fantagio. (Source: Wikipedia) Watch drama online for free.