Steve Sueng Jun Yoo, also known as his Korean name Yoo Seung-jun, is a South Korean-born American singer, dancer, rapper and actor who became one of South Korea's most popular K-pop stars after his debut in 1997. Yoo's music career ended in 2002 when he was accused of evading South Korean mandatory military service by becoming a U.S. citizen. He was subsequently banned from entering South Korea, becoming the only person in history to be banned from the country for acquiring another citizenship. Since then, Yoo worked as an actor in China.

K-pop, short for Korean popular music, is a form of popular music originating in South Korea as part of South Korean culture. It includes styles and genres from around the world, such as pop, hip hop, R&B, rock, jazz, gospel, reggae, electronic dance, folk, country, disco, and classical on top of its traditional Korean music roots. The term "K-pop" became popular in the 2000s, especially in the international context. The Korean term for domestic pop music is gayo, which is still widely used within South Korea. While "K-pop" can refer to all popular music or pop music from South Korea, it is colloquially often used in a narrower sense for any Korean music and artists associated with the entertainment and idol industry in the country, regardless of the genre.