It became the first debut song by a K-pop group to earn a platinum certification from the Korea Music Content Association (KMCA).

The lead single "Wannabe" was their third to enter the top ten of the Circle Digital Chart and was certified gold in Japan and the United States.

On August 17, the group released their third EP and second number-one album Not Shy; its lead single of the same name reached the top ten in South Korea and was certified gold in Japan.

On April 30, 2021, Itzy released their fourth EP Guess Who and its single "In the Morning", both of which entered the top ten of their respective charts.

The group's sixth and seventh EPs Cheshire and Kill My Doubt were released on November 30, 2022 and July 31, 2023; both reached number one on the Circle Album Chart and the top 25 on the Billboard 200, and sold over a million copies.