In August 2017, JYP Entertainment (JYPE) officially announced the agency's new reality survival show to launch a male idol debut project. More details and teasers were released in the next two months, including the show's title—Stray Kids. Prior to its premiere on October 17, JYPE released Stray Kids' first music video for a song titled "Hellevator", which was later released as a digital single. Two members, Lee Know and Felix, were eliminated from the group, but all nine members ended up in the final line-up.
Before the official debut of Stray Kids, the nine members were chosen as new models to endorse Jambangee Jeans in 2018, which was announced on February 13 with the brand's spring collection. On June 26, they were selected as an exclusive model of Ivy Club for the 2018 Fall semester. On July 19, they received for the first set of their CF with Minute Maid Sparkling. Five days after their first CF, they were selected to be promotional models for CGV "Youth Brand Festival" from July 24 to August 31. On September 19, Stray Kids has been chosen as the newest ambassador of Lotte Duty Free. It was announced at Lotte Duty Free official YouTube and Instagram accounts. On October 16, Stray Kids became the new model of the Korean sportswear brand “Pro-Specs”. On June 17, 2019, Stray Kids was chosen as the newest ambassador of Talk Talk Korea Contest in 2019, and June 18, they were appointed as an honorary ambassador by the Korean Culture and Information Service, Ministry of Culture, Sports and Tourism.
Stray Kids (Korean: 스트레이 키즈; RR: Seuteurei kijeu; often abbreviated as SKZ) is a 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. Originally a nine-piece group, member Woojin left Stray Kids due to undisclosed personal reasons in October 2019. The group released their extended play Mixtape in January 2018 and officially debuted on March 25 with I Am Not.
Along with the launch of Stray Kids' official website, JYPE announced the release of the group's pre-debut extended play (EP) titled Mixtape. It contains seven tracks co-written and co-composed by the members, including "Hellevator" and other songs that they performed during the show. The EP, along with the performance video of its second track titled "Beware" (Korean: Grrr 총량의 법칙), was released on January 8, 2018, while the performance video of "Spread My Wings" (Korean: 어린 날개) was uploaded online a week later. It debuted at number 2 on Gaon's Album Chart and Billboard's World Albums chart.
On March 5, JYPE announced the group's third comeback on March 25, 2019 with the release of their fourth extended play Clé 1: Miroh, in commemoration of the first anniversary of the group's debut. The group earned their first music show win on 4 April on M Countdown for the album's lead single, "Miroh." On June 19, the group released their first special album Clé 2: Yellow Wood, along with title track "Side Effects" (Korean: 부작용) between the American leg and the European leg of their first world tour.
Stray Kids released the digital single titled "Mixtape : Gone Days", the first single of Mixtape Project on December 26, 2019.
Stray Kids released the first English version of "Double Knot" and "Levanter" as the digital single Step Out of Clé, along with "Double Knot" English version music video on January 24, 2020.
Stray Kids made an official Japanese debut on March 18, 2020 with compilation album SKZ2020 in Japan and South Korea, with the new record of previous songs and including Japanese version of "My Pace", "Double Knot" and "Levanter" (風) that released as single before
Stray Kids released the Mixtape Project second digital single titled "Mixtape : On Track" (바보라도 알아) on March 26, 2020
On June 3, 2020, Stray Kids released their first Japanese single album titled "Top". It is used as the theme song for the anime Kami no Tō -Tower of God-. A Korean version was released on May 13 , and an English version on May 20.
On June 17, 2020, Stray Kids released their first studio album called Go Live (Korean: GO生, romanized: Gosaeng) with title track "God's Menu" (Korean: 神메뉴, romanized: Shinmenyu), and including Korean version of "Top" and "Slump" and previous released single "Gone Days" and "On Track".