Lee Bong Gu, known professionally by his first name Bongu, is a South Korean singer and half of the duo "GilguBonggu". He joined Kang Gil Gu in 2006 but did not release any music and instead were only backup singers for many well-known celebrities such as Gummy, Baek Ji Young or Taeyang and served as vocal trainers for idols like Oh My Girl or BTOB. The pair finally made their debut in 2013 with the single "I’m Going Crazy". After a period of obscurity, he appeared on the show "Duet Song Festival" and teamed up with a farmer and the pair were so popular, they ended appearing 12 times. He married his non-celebrity girlfriend in March 2022. He is currently represented by Trius Entertainment.
(Source: Korean = Namu Wiki || Translation = MyDramaList)