Roots of Super Junior

SS501 is a South Korean boy band that was formed under the management of DSP Media. The group debuted on June 8, 2005, with five members: Kim Hyun-joong, Heo Young-saeng, Kim Kyu-jong, Park Jung-min and Kim Hyung-jun. They debuted in 2005 with the EP Warning, which included their first number one song, "Never Again". In 2007, SS501 entered the Japanese market with the maxi single Kokoro, which debuted at number five on the Oricon chart. The following year, in 2008, they became the first South Korean artists to win the award for Best New Artist at the Japan Gold Disc Awards. SS501 has released two studio albums and seven EPs in Korean, and two studio albums and three EPs in Japanese.

Jeong Soon-won, better known by his stage name The One is a South Korean singer and vocal coach. He debuted in 1997 as a member the group Space A and released his first solo album in 2002. He has released a total of five albums in Korean and one in Mandarin. As a vocal coach, he has taught K-pop singers including members of Girls' Generation and Super Junior.