The second boy group from Big Hit Entertainment, Tomorrow X Together (TXT), which is meant "tomorrow by together". The group made their debut on March 4, 2019 with the EP, The Dream Chapter: Star.

They debuted on March 4, 2019 with the extended play (EP) The Dream Chapter: Star. The EP was the highest-charting debut album by a male K-pop group at the time, peaking at number one on the Gaon Album Chart, Billboard World Albums Chart, and US Billboard 200. TXT made their Japanese debut on January 15, 2020, with the release of the single "Magic Hour", which includes the Japanese versions of their songs "Run Away", "Crown" and "Angel or Devil". The song debuted at the top of both the Oricon Weekly Singles Chart and the Oricon Daily Singles Chart, both at number one.

Aespa is a girl group formed by SM Entertainment. The group consists of four members: Karina, Giselle, Winter, and Ningning. They debuted on November 17, 2020, with the digital single "Black Mamba".

A video trailer featuring all four members was revealed on November 2, alongside the announcement of the release of Aespa's debut single, "Black Mamba", on November 17. The group's performance of "Black Mamba" on KBS2's Music Bank on November 20 marked their broadcast debut. Aespa signed a contract with Creative Artists Agency on July 22, 2021, for their future activities in the United States. Aespa received their first Daesang (Stage of the Year) at the Asia Artist Awards on December 2, 2021. The group received their second Daesang for Record of the Year at the 2021 Melon Music Awards two days later, on December 4.

The Boyz is a boy band formed and managed by IST Entertainment. On December 6, 2017, the group debuted with the lead single "Boy" from their first EP, The First. The members of the group are Sangyeon, Jacob, Younghoon, Hyunjae, Juyeon, Kevin, New, Q, Ju Haknyeon, Sunwoo, and Eric. Hwall formerly made up the group until his departure in October 2019. On October 11, 2017, the group made their pre-debut special music video debut with the song "I'm Your Boy".

The members of The Boyz have grown as musicians since their debut, experimenting with a range of genres including R&B, hip-hop, ballad music, J-Pop, and Dance-Pop, among others. Some of TBZ's most well-known songs are "THRILL RIDE", "Reveal" and "The Stealer", among others. They are well-known for their catchy music and unforgettable stages.

ITZY is a five-member girl group under JYP Entertainment. The group's debut single album, "It'z Different", with the single "Dalla Dalla", was released on February 12th. The song's empowering lyrics and featured elements from EDM subgenres including future house and bass house were well received by audiences. Itzy won their first music show on M Countdown on February 21, eight days after making their debut. This broke the record for the fastest time for a girl group to win their first music show.

The group has won many accolades such as Rookie of the Year at the 34th Golden Disc Awards, New Artist of the Year at the 9th Gaon Chart Music Awards and 2019 Melon Music Awards, Best New Female Artist at the 2019 Mnet Asian Music Awards, and the New Artist Award at the 29th Seoul Music Awards. They are also the first K-pop girl group to achieve the "Rookie Grand Slam".

Stray Kids is an eight-member boy group under JYP Entertainment. Following the release of their pre-debut EP Mixtape, the group made their debut with their second extended play (EP), I Am Not, on March 26, 2018. In 2018, the group released two new EPs, I Am Who in August and I Am You in October, all of which received favorable critical and commercial reviews. The four EPs earned the six new artist awards in 2018 and early 2019.

Additionally, Stray Kids was nominated twice for Artist of the Year in 2018, once at the Mnet Asian Music Awards and once at the Genie Music Awards. At the 2019 Asia Artist awards, Stray Kids won the Star15 Popularity Award, becoming the group's first popularity accolade.

(G)I-dle is a multi-national girl group under Cube Entertainment. There are five people in the group: Miyeon, Minnie, Soyeon, Yuqi, and Shuhua. The title track "Latata" from (G)I-dle's debut mini-album "I am" was released on May 2, 2018.

The group released their third EP "I Trust" after signing with Republic Records in the US in 2020, becoming just the fourth girl group to sell 100,000 copies of an album in its first week. The girl group's 2020 single album Dumdi Dumdi went on to become the second-best-selling single album of all time. Unlike the majority of K-pop girl groups, (G)I-dle play an active role in the production of their music. Soyeon, Minnie, and Yuqi, in particular, have contributed to and produced the majority of the group's songs. (G)I-dle were dubbed "monster rookies" in 2018, and are now regarded as one of the most popular South Korean girl groups to come from outside the "big three" record labels.

STAYC is a six-member girl group under High Up Entertainment. The name group means Star To A Young Culture, "reflects the act's aim of dominating pop culture".

Famous music producers Black Eyed Pilseung, who also founded High Up Entertainment, are behind the group's production. The group made their debut with the self-titled single album "Star To A Young Culture", which includes two songs "Like This" and lead single "So Bad". The music video for the album's lead single, "So Bad" was released on November 12 and attracted over 2.6 million views on its first day. Their album was released on the same day and went on to sell more than 4,300 copies, which is a record for a girl group's debut in 2020. It went on to sell more than 10,000 copies in its first week, making history as the first girl group debut album to do so in 2020.

Enhypen is a seven-member boy group under Belift Lab. They were formed as a result of the reality show I-LAND, and on November 30, 2020, they released their debut mini-album, Border: Day One. With the exception of the leader, ENHYPEN members do not hold any formal positions or functions. The goal is for each member to be able to fulfill all positions with excellence.

The group's debut was announced through a trailer named "Choose-Chosen" that was uploaded to Enhypen's YouTube channel on October 22, 2020. The group accumulated more than a million followers on social media before making their public debut. On November 4, the group garnered more than 150,000 pre-orders in only two days, and by November 21, pre-orders had topped 300,000 copies. On November 30, the EP and lead track "Given-Taken" were released along with a live showcase promotion. Enhypen made their broadcast debut on KBS' Music Bank on December 4 when they performed "Given-Taken."

Ateez is a boy band formed by KQ Entertainment. On October 24, 2018, they made their debut with the extended play (EP) Treasure EP.1: All to Zero. Ateez won Worldwide Fans' Choice at the 2019 and 2020 Mnet Asian Music Awards and the Next Generation Award at the 2019 Golden Disc Awards.

Ateez have released eight EPs, one studio album in the Korean language, and one EP and two studio albums in the Japanese language as of March 2022. Over three million physical records of Ateez have been sold globally. The group has served as official global ambassador for Korean culture and tourism. They are referred to as "Global Performance Idols" by Korean media and are known as "4th Generation Leaders" by the Korean Ministry of Culture, Sports, and Tourism.

Treasure is a South Korean–Japanese boy band that was created in 2019 by YG Entertainment through the reality-survival program YG Treasure Box (2018).

The First Step: Chapter One, the first release in The First Step series, marked Treasure's debut on August 7, 2020. Over 170,000 pre-orders were made before the physical release on August 13 by several days. In Japan, "Boy," the album's lead track, achieved commercial success, topping music-streaming services such as Line Music, Rakuten, and the AWA rising chart. The "Boy" music video received more than 10 million views on YouTube in just 26 hours, 20 million views in six days, and finally 100 million views. The Korea Music Content Association (KMCA) awarded the group platinum certification for the single album, the group's first ever certification.