AtHeart (앳하트) is a K-POP girl group formed by TITAN CONTENT. The group is composed of seven members: Michi (미치), Arin (아린), Katelyn (케이틀린), Bome (봄), Seohyeon (서현), Aurora (아우로라), and Nahyun (나현).

TITAN CONTENT announced on July 16, 2024, that they were preparing to debut their first U.S.-based girl group, AtHeart, aiming to bring a “NEXT-GENERATION” K-pop strategy to the global stage. On the same day, the first two members, Sorin (소린) and Michi, were introduced through individual Instagram accounts. Later, on November 12, Seohyeon, Katelyn, and Aurora, were revealed. And on February 19, 2025, Nahyun, Arin, and Bome were added to the lineup. and Sorin was revealed to have departed the group after her posts and social media accounts were deleted.

On February 21, 2025, AtHeart confirmed their 7-member debut lineup and announced plans to officially debut in July 2025. Their social media accounts and debut teaser were launched, alongside the announcement of a pre-debut single titled “Good Girl (AtHeart),” set to release its music video on March 14. The track was first teased in a commercial for SAVAS Shape & Beauty on March 4. While only the music video was released on March 14, it was later confirmed that the full single would be available streaming platforms on May 29.