ITZY was official revealed on January 20, 2019 with a YouTube video titled "PROLOGUE FILM : ITZY? ITZY!". The video revealed the five members of the group, Yeji, Lia, Ryujin, Chaeryeong, and Yuna, and the group's official website and social media accounts. This was followed by multiple sets of image teasers and video teasers leading up to their debut.
ITZY dropped the music video for their debut track "DALLA DALLA" on February 10, 2019. The music video broke the previous record for most views within a 24-hour period in only 12 hours with 5 million views. The video went on to reach 14 million views in 24 hours. The song also led to their first music show win on February 21st's episode of M Countdown, giving them the record for fastest girl group to win #1 after debut.
The group's commercial success has earned them several 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.
Their first full-length Korean album, CRAZY IN LOVE, is released this week on September 24th.