AtHeart

2023-2025: Formation and introduction

Nikki Semin-Han, who was the former chief executive officer (CEO) of SM Entertainment, co-founded entertainment agency Titan Content on November 28, 2023. They had planned in launching two girl groups with global auditions occurring the next year. After scouting locations, the agency announced on July 16, 2024, that Michi and Sorin were the first members for upcoming South Korean girl group AtHeart. The group name simply indicates their "genuine nature" to have the connection and love between them and their fans, to ensure the empowerment of being authentic.

Maeil Business Newspaper were perplexed for this decision, because individuals and their social media accounts are kept confidential until the group is finalized. Revealing their identities simultaneously was unconventional. Katelyn, Seohyeon, and Aurora were then introduced to the public on November 12 for AtHeart. Although the group became a five-piece ensemble, the agency had more members to recruit before their debut. Three months later, the seven-member group was established, unveiling Nahyun, Arin, and Bome on February 21, 2025. Teen Vogue interviewed them showcasing their influences and strengths; Sorin was later removed from publication as she is no longer debuting with AtHeart.

Titan Content subsequently partnered with Imperial Music, a division from Republic Records, that "makes them the ideal partner for this venture." AtHeart started to upload teasers showcasing their pre-debut song and uploaded a music video titled "Good Girl (AtHeart)" through video sharing platform YouTube on March 14. It was soon released worldwide digitally for music download and streaming on May 29. The same day, Dreamus announced they will exclusively distribute any music release from AtHeart, along with merchandising in South Korea.

A month later, AtHeart confirmed on July 10 they would release their debut extended play (EP) in the upcoming month. While promoting the project, the next day it was announced that Aurora was excluded due to health-related problems. Plot Twist was later released globally on August 13, which includes five songs in its tracklist. A teaser trailer for its title track was uploaded, with singer Choi Soo-young (of Girls' Generation) appearing as a mentor. The same month, AtHeart soon would make their first televised performances through multiple music programs, such as M Countdown, Show! Music Core, and Inkigayo.

Kwon Saebom of Billboard Korea named the group as Rookie of the Month, where she sees them understanding each other's "cultural and linguistic backgrounds" marking their traits as a "defining strength." AtHeart then released an English-language rendition of "Plot Twist" on October 10, along with two remixed versions at the end of the month. Titan Content launched them a promotional tour in the United States, in order to accelerate the group onto the global market. AtHeart later performed and were interviewed by Good Day New York on November 21, becoming one of the first K-pop groups to debut early on U.S. television.

2026-present: Standalone recordings

Two months later, a new logo was unveiled and revealed their fandom name as Heartbeats on January 29, 2026. Soon after, two digital singles titled "Shut Up" (February 26) and "Butterfly Doors" (March 11) were released along with its respective music videos. AtHeart had also headlined the 42nd Tokyo Girls Collection making their first debut in Japan for the semiannual fashion festival.

Eventually, the group announced a project to cover two songs from other musical groups, to commemorate their 30th anniversary. "Say It" was released on June 25, as a reinterpretation of "Lovefool" (1996) by Swedish band the Cardigans; this marked the return of group member Aurora. She would then go hiatus again for her health concerns and recovery on August 18. The next day, AtHeart released a remake of "3!4!", a song originally made by co-ed group Roo'ra. A fan signing event was scheduled on September 12, but was postponed due to group member Seohyeon being tested positive for COVID-19 in its prior day.

• Michi (미치)
• Arin (아린)
• Katelyn (케이틀린)
• Bome (봄)
• Seohyeon (서현)
• Aurora (아우로라)
• Nahyun (나현)

Extended plays

Singles

Music videos