Bang Yongguk (Hangul: 방용국; born March 31, 1990), often simply known as Yongguk, Bang or Jepp Blackman, is a South Korean songwriter, rapper, singer and dancer. He is the leader and the main rapper of the South Korean group B.A.P.

In 2007, Yongguk was part of an underground hip-hop group called Soul Connection under the alias of "Jepp Blackman". In March 2011, he was featured in Song Jieun's Going Crazy and the single became a number one hit in South Korea. In July, Yongguk released his first solo digital single "I Remember", featuring BEAST's Yoseob. He afterwards promoted in a sub-unit called Bang&Zelo with fellow B.A.P member Zelo. Bang&Zelo released their single "Never Give Up" in November, 2011.