•
Mommy Son : The pink-masked Korean rapper which was later revealed to be former season 2 contestant and
season 5 judge
Mad Clown. After passing the Rapper Selection round, fellow contestants, notably Snacky Chan and Pento, questioned Mommy Son's real identity, in which he later revealed his true identity to them. After the show's first episode, netizens posted comments on Mad Clown's Instagram page stating that Mad Clown was indeed Mommy Son, in which he quickly shut down the rumors that he's not the man behind Mommy Son and instead gave Mommy Son's actual Instagram account. In the Rapper Open Evaluation Round, the judges, notably
Swings, asked him to remove the mask, knowing that it was Mad Clown all along. However, he refused to do so, stating that the mask is an artistic tool for him to fully express himself as an artist and the Mommy Son character is solely for his joy regardless of whether they found out his true identity. Unfortunately, Mommy Son was eliminated after forgetting his lyrics. Following his elimination from the show, he released a hilarious diss rap "Shonen Jump", dissing the judges from the show and expressing his strong desires to get back up. His popularity grew, which resulted in multiple magazine and television appearances, and fans wearing pink masks and gloves to imitate him. •
Onesun : First generation Korean hip-hop artist who previously auditioned in season 5 and season 6, where he was known for his famous phrase "Let Me Do it Again" after failing the latter season's preliminary round. He returned this season but failed to pass the Rapper Selection round. •
Owen Ovadoz : Rapper and member of the crew/record company MKIT RAIN alongside fellow contestants Nafla and Loopy. Previously participated in seasons 3 and 4. Eliminated in the Fight Money Battle Round. •
Choi Eun-seo : 15 year old rapper who is a member of AS Clan. Eliminated in the Fight Money Battle Round. •
Snacky Chan : Rapper under Dynasty Muzik. Previously participated in
season 3 as a member of Team YG and in seasons four and five. Eliminated in the Fight Money Battle Round. •
Osshun Gum : Rapper under Just Music and first runner-up of the first season of
High School Rapper. Eliminated in the Fight Money Battle Round. •
Reddy : Rapper under
Hi-Lite Records. Previously participated in
season 5 as a member of Team YG. Eliminated in the Revival Round. •
Maniac : Korean-American veteran rapper under his own label, PayDay Entertainment. Previously a member of Jiggy Fellaz, Dynasty Family, New Dynasty and Uptown crews. Also known as "1-Shot" and "OG" with Uptown. Previously participated in
season 6 as a member of Team Feel Ghood Music. Originally passed the Rapper Open Evaluation Round with 300,000 won, he was not seen in the Fight Money Battle Round. There is a possibility that he has voluntarily left the show, reasons unknown. •
Ness : Korean-American rapper currently signed under iiA, also known by the moniker 'Noctunes'. Previously participated in
season 6 as a member of Team H1GHR MUSIC. Eliminated in the Rapper Open Evaluation Round. •
Ryno : Member of the hip-hop collective crew New Area Aliens. Previously participated in
season 6 as a member of Team Dynamic Duo. Eliminated in the Fight Money Battle Round. •
Simba Zawadi : Rapper under Luminant Entertainment. Previously auditioned in
season 6. Prior to this season, he had a three-year feud between him, judge/producer Paloalto and his record label Hi-Lite Records. However, Paloalto extended his hand to Simba Zawadi and congratulated him after passing the Rapper Open Evaluation Round, marking the end of their long-standing feud. Eliminated in the Fight Money Battle Round. •
Swervy : The only female rapper this season to advance further to the Fight Money Battle Round. Member of Team YAYA crew. Eliminated in the Fight Money Battle Round. She became the first female artist to sign with Hi-Lite Records after the show ended. •
Jo Woo-jin : Rapper who previously participated in season 2. He dissed judge/producer Swings, who was also a participant in season 2, through a track titled "Switch" in 2017. At the Rapper Selection Round, he volunteered to be judged by Swings. Swings was upset upon seeing him due to this issue, but then passed him after his rap, saying that he has improved his rapping skills. He was eliminated in the Rapper Open Evaluation Round. •
Louie : One-half of the rap duo
Geeks and member BUCKWILDS crew, signed under Rainbow Bridge World. His rap partner,
Lil Boi, participated in
season 4 as a member of Team AOMG. Louie was eliminated in the Fight Money Battle Round. •
Dayday : Former member of Dalmatian. Known by his real name David Kim. Previously participated in
season 4 and
season 5 both as a member of Team AOMG. Eliminated in the Fight Money Battle Round. •
NO:EL : Rapper under Indigo Music, the sub-label of Just Music, and part of the COZYBOYS crew alongside fellow contestant Kid Milli. Known by his real name Jang Yong-joon. Previously participated in
season 6 and dropped out of the first season of High School Rapper due to prostitution and bullying controversies. Eliminated in the Revival Round. •
H2ADIN : Second runner-up and fourth-runner up of the first and second season of
High School Rapper respectively. Known by his real name Jo Won-woo. Eliminated in the Fight Money Battle Round. •
JJK : Veteran freestyle rapper and Leader of the Angdreville Crew (ADV). Previously participated in
season 6. Eliminated in the Fight Money Battle Round. •
Bully Da Ba$tard : Ex-member of DICKIDS crew. Previously auditioned for
season 6 but was disqualified after posting on social media that he passed that season's preliminary round before that season started its broadcast. He also was a contestant on the first and second season of
High School Rapper having both Swings and Deepflow as mentors. Eliminated in the Revival Round. •
Changstarr : Korean-American rapper who has a great appreciation to the hippie culture. He assisted in providing English translations of Swings' Just Music label music tracks and also made a cameo on
Lil Uzi Vert's P's and Q's music video. During the Fight Money Battle Round, he made a comment on the show's female DJ Vani "She's really hot though" prior to the start of the performance. However, he suddenly forgot his lyrics, causing him to be eliminated. Judge/producer Swings commented that saying such comments will obviously cause him to forget his lyrics, while judges/producers The Quiett and Code Kunst stated that he should not have auditioned for the show if he is not serious enough to compete. At the end of the show, Changstarr explained through his Instagram account that he made the comment on the DJ in an attempt to lighten up the mood of the judges/producers and the remaining contestants due to the very long and exhausting recording schedule for that round. Furthermore, he clarified that he was not nervous at that time but was very exhausted, causing him to forget his lyrics. •
New Champ : Previously participated in season 4 where he was a member of Team YG, and auditioned in seasons 3 and 6. Signed under FAME Records' sub-label Urbane Music. Eliminated after the Team Choosing Round despite being chosen by Team Hi-Lite & AOMG, after Loopy replaced him from the team. •
Boo Hyun-seok : Previously participated in season 3 as a member of Team Brand New Music. Also known by his rapper name SNAP OUT. Eliminated after the Team Choosing Round despite being chosen by Team Illionaire Ambition, after Superbee replaced him from the team. •
Black Nine : Known for his hardcore rap style. Previously participated in season 6 as a member of Team Feel GHood Music where he eventually signed to their label company two months after that season ended. Eliminated after the Team Choosing Round despite being chosen by Team VMC, after EK replaced him from the team. •
Lee Su-rin : Rapper and ex-leader of Dickids crew and member of XXYXNAF crew. Signed under FAME Records. Previously participated in season 5 and the first season of High School Rapper. Also known by his rap names LUDA, TRAPSTARSUREEN, UNOFFICIALBOYY, and Baddie Homie. Eliminated after the Team Choosing Round despite being chosen by Team Illionaire Ambition, after Coogie replaced him from the team. •
Zene the Zilla : Member of Young Thugs Club (YTC). Eliminated after the Team Choosing Round despite being chosen by Team VMC, after Los replaced him from the team. He signed with Ambition Musik in 2019. •
Sway D : Rapper and producer under
Hi-Lite Records. Eliminated in the Rapper Open Evaluation Round. ==Controversies==