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Itzy (stylized as ITZY; Korean: 있지; RR: Itji) is a South Korean girl group formed by JYP Entertainment, consisting of members Yeji, Lia, Ryujin, Chaeryeong, and Yuna. The group debuted on February 12, 2019, with the release of their single album, It'z Different. The group's commercial success has led to them earning several new artist of the year awards, including Rookie of the Year at the 34th Golden Disc Awards and Best New Female artist at the 2019 Melon Music Awards and the 2019 Mnet Asian Music Awards.
Chaeryeong auditioned for Fantagio but didn't pass, so she auditioned for JYP Entertainment and passed as a trainee. Chaeryeong trained with JYP for five years. Ryujin got scouted at a GOT7 concert. After that, she trained with JYP for four years until ITZY's debut in 2019. Yuna was discovered by JYP Entertainment in 2015 while Yuna trained with JYP Entertainment for three years. Yeji auditioned for JYP Entertainment in 2015. She trained for three years with JYP. Before she was a trainee at JYP, Lia was a trainee with SM Entertainment. Lia went on to become a trainee at JYP Entertainment. She trained for two years.
Chaeryeong was a contestant on K-pop Star 3 in 2013. She then went on to compete in JYP Entertainment's (JYPE) survival show Sixteen in 2015. However, she did not make the cut to become a member of the winning girl group, Twice.
In 2018, Ryujin was a contestant on JTBC's survival show Mix Nine. She placed first among the girls in the competition but lost to the boys for the overall winners.
In 2017, Yuna and Ryujin appeared in BTS’s “Love Yourself” Highlight Reel.
All of the members, except Lia, appeared in Mnet's reality show Stray Kids as a project group against the boy group Stray Kids in 2017.
In 2018, Yeji was a contestant on SBS' The Fan, but was eliminated in episode 5.
On January 21, JYP Entertainment announced that they would be debuting a new girl group, the first since Twice's debut in 2015. The label's official channel uploaded a video trailer revealing the five members.
On February 12, the group released their debut single album, It'z Different, with its lead single "Dalla Dalla". The song incorporates elements from EDM sub-genres, such as future house and bass house. Its empowering lyrics have been well received by the audience. The group scored one of the biggest Billboard debuts for a new K-pop act in years, single "Dalla Dalla" entered at No. 3 and peaked at No. 2 on the World Digital Song Sales chart. The shape-shifting confidence anthem sold 2,000 downloads in the U.S. for the week ending February 14, according to Nielsen Music, making it the best-selling K-pop song in America that week. "Want It?," released alongside the single "Dalla Dalla," debuted at No. 8 selling 1,000 downloads. "Dalla Dalla" also debuted as the second most popular song on YouTube.
Billboard confirmed that the music video surpassed 17.1 million views within 24 hours of its release and broke the record for the most viewed K-pop debut music video within 24 hours. On February 21, eight days after their debut, Itzy received their first music show win on M Countdown and became the fastest girl group to achieve their first music show win. The song went on to win 9 music show wins. "Dalla Dalla" also broke the record at the time for the fastest K-pop debut music video to reach 100 million views on YouTube.
Itzy's debut EP, titled It'z Icy was released on July 29, 2019, along with an accompanied music video for its lead single titled "Icy". Commercially, the EP was a success, peaking at number 3 on the Gaon Album Chart. "Icy" continued their success on music shows, earning 12 wins, including a triple crown on Show Champion. On September 22, JYPE announced Itzy's showcase tour titled Itzy Premiere Showcase Tour "Itzy? Itzy!". A showcase tour kicked off in Jakarta on November 2 which would then go on to different cities in Asia throughout the end of 2019 before heading to the United States for five shows in January 2020.
In November 2019, "Dalla Dalla" surpassed 100 million streams on Gaon Music Chart, becoming the group's first platinum certification. It is also the first debut song by a K-pop group to earn a platinum certification from the Korea Music Content Association since the introduction of the certifications in April 2018. The single also ranked No. 8 on the list of "The 20 Best K-pop Songs of 2019" by Dazed, which stated that the group "keep a steady hand on the rudder using the fun touches even with the visual and sonic chaos going on around" and "the ones to give K-pop a fresh boot up". The music videos of "Dalla Dalla" and "Icy" entered the list of South Korea's most popular music video on YouTube, at No. 2 and 7 respectively. At the end of the year, Itzy was recognized with several Best New Female Artist awards, including the 2019 Melon Music Awards and the 2019 Mnet Asian Music Awards.
Itzy started the year with the continuation of their showcase tour in the United States, starting on January 17 in Los Angeles.
On March 9, Itzy released their second EP, It'z Me, and its lead single "Wannabe". Featuring producers such as Sophie and Oliver Heldens, the EP saw the group experiment with EDM sounds, while maintaining their lyrical themes of freedom and self-determination to what comes their way. The EP debuted at number one on South Korea's Gaon Album Chart, making it the group's first number one album in the country. It also debuted at number 5 on Billboard's World Albums chart, their highest position on the chart. The group went on to achieve 8 music show wins with "Wannabe," continuing their success on the platform.
On August 17, Itzy released their third EP Not Shy as well as the music video for the lead single of the same name. While maintaining Itzy's signature "teen crush" pop sound, the album reflected a lyrical shift, as the group transitioned from "themes of independence and self-love" to "tipping their toes into the waters of singing about love." The EP debuted at number one on the Gaon Album Chart with sales of over 219,048 units. It was their second release to top the chart. "Not Shy" was also promoted on music shows, going on to achieve 5 wins.
On March 20, Itzy released the digital single "Trust Me (Midzy)", a song dedicated to their fans, as part of their first global livestream event.
On April 30, Itzy released their fourth EP Guess Who and its lead single "In the Morning". On May 11, the EP entered into the Billboard 200 at number 148, making it their first appearance into the list. The English version of "In the Morning" was released on May 14.