Yoo Chang Hyun, known professionally as Ricky, is a South Korean singer, dancer, child actor, model and member of TEEN TOP (틴탑). He graduated from Seoul Performing Arts High School and is enrolled in the Practical Music program at Seoul Hoseo Arts Practical Vocational School. He is the younger brother of former ALPHABAT member Yoo Yeong Jin (known professionally as E:psilon). Before officially debuting, he appeared in Seo Taiji's MV for "Human Dream" and later portrayed the young version of Song Seung Heon's character in "Love Song". He made his debut as a child actor and model in 2005, appearing in EBS's "Vacation Life Litte Exploration Team" (EBS방학생활 꾸러기탐험대). He made his debut as a singer in July 2010 as TEEN TOP's lead vocalist and vocalist with their first single album, "Come Into The World". They are managed by TOP Media (티오피미디어) and have gathered a strong international fanbase, especially in Latin America. He enlisted for his mandatory military service on January 18, 2021, and was discharged on July 17, 2022. (Source: MyDramaList) Watch drama online for free.