Monsta X

Photo source: twitter.com
South Korean boy band formed through the reality survival program No.Mercy by Starship Entertainment. The group is composed of six members: Shownu, Minhyuk, Kihyun, Hyungwon, Joohoney, and I.M. Monsta X won and was nominated to many Korean and international awards. In 2018, their Japanese single Spotlight received an official gold certification by the Recording Industry Association of Japan.
EXO

Photo source: kbsworld.kbs.co.kr
South Korean–Chinese boy band formed by SM Entertainment. The group is composed of nine members: Xiumin, Suho, Lay, Baekhyun, Chen, Chanyeol, D.O., Kai, and Sehun. The band ranked as one of the top five most influential celebrities on the Forbes Korea each year from 2014 to 2018, and have been named “the biggest boy band in the world”.
Seventeen

Photo source: medium.com
South Korean boy group formed by Pledis Entertainment in 2015. The group consists of 13 members divided into three sub-units, each with a different area of specialization: a 'Hip-Hop Unit', 'Vocal Unit', and 'Performance Unit'. Seventeen has released three studio albums and six extended plays. Seventeen have also gained several awards for choreography and dance performance.
GOT7

Photo source: Getty Images
South Korean boy band formed by JYP Entertainment. The group is composed of seven members: JB, Mark, Jackson, Jinyoung, Youngjae, BamBam, and Yugyeom. Got7 debuted in 2014 with the release of their first EP Got It?, which peaked number one on Billboard's World Albums Chart. GOT7 gained attention for their live stage performances, which often includes elements of martial arts tricking and street dancing.
BTS

Photo source: Jeff Kravitz/Filmmagic For Dcp
South Korean boy band formed in 2010 by Big Hit. The group is composed of seven members: Jin, Suga, J-Hope, RM, Jimin, V Jungkook. The band has staged several world tours. During their Love Yourself World Tour, BTS became the first Asian and first non-English speaking act to headline and sell out Wembley Stadium. BTS is one of the most successful K-pop bands in the music history of South Korea.
WINNER

Photo source: YG Entertainment
South Korean boy band formed in 2013 by YG Entertainment through reality survival program WIN: Who Is Next. The group consists of four members, Jinwoo, Seunghoon, Mino, and Seungyoon. They won numerous awards, including at the Mnet Asian Music Awards and the Melon Music Awards.
NCT

Photo source: m.weibo.cn
South Korean boy group formed by SM Entertainment. The group's concept is having an unlimited number of members divided into multiple sub-units based in various cities worldwide. The group consists of 21 members.
The group's units NCT U and NCT 127, NCT Dream made their debut in 2016. The fourth unit WayV, based in China, debuted on January 17, 2019.
SuperM

Photo source: Courtesy Capitol Records Group
South Korean pop group formed in 2019 by SM Entertainment and Capitol Music Group. The group includes seven members from four SM boy bands: Taemin from Shinee, Baekhyun and Kai from EXO, Taeyong, and Mark from NCT and Ten and Lucas from WayV. On October 4, 2019, the group debuted with their self-titled EP. SuperM had their debut concert at the Capitol Records Building in Los Angeles and made their television debut on The Ellen DeGeneres Show.
ASTRO

South Korean boy band formed by Fantagio. The group is composed of six members: MJ, Cha Eun-woo, Moonbin, Jinjin, Rocky and Yoon Sanha. They debuted in 2016, and were subsequently named by Billboard as one of the best new K-pop groups of 2016. Astro have also gained several nominations and awards.
Stray Kids

Photo source: JYP Entertainment
South Korean boy band formed by JYP Entertainment through the 2017 reality show of the same name. The group is composed of eight members: Bang Chan, Lee Know, Changbin, Hyunjin, Han, Felix, Seungmin, and I.N. The group officially debuted on March 25 with EP I Am Not. They received and were nominated for many Korean awards. At the 2019 Asia Artist awards, Stray Kids won the Star15 Popularity Award, becoming the group's first popularity accolade.