The group
Hearts2Hearts is an eight-member girl group comprising Jiwoo, Carmen, Yuha, Stella, Jooeun, Aena, Ian, and Yeon. They debuted under SM Entertainment on 24th February 2025. The group goes by the abbreviation H2H; their fan community is called S2U (pronounced "Hachu"). The name Hearts2Hearts reflects the group's stated ambition to connect with fans worldwide through music filled with sincere emotion, building what they describe as "a greater us." Six of the eight members are South Korean; Carmen holds Indonesian nationality, while Stella has dual South Korean and Canadian citizenship. The group is SM's first girl group since aespa debuted in 2020 — a gap of roughly four years and three months — and its first new act of any kind since the boy group RIIZE launched in 2023.
Rise: SM's girl-group gamble
Hearts2Hearts made anything but a quiet entrance. Their debut single, "The Chase," set a new record for first-week physical CD sales among all debuting girl groups in South Korean chart history. SM positioned the group as occupying a creative space between its legendary acts Girls' Generation and f(x), built around a concept the label calls "breaking inertia" — a deliberately paradoxical idea of choosing convention in order to subvert it. The debut single established a mysterious, otherworldly mood; the follow-up, "STYLE," shifted towards a more playful, girl-group sensibility, mapping out the act's creative range step by step.
The metrics that followed left little room for doubt. "The Chase," "STYLE," and "FOCUS" each surpassed 100 million streams on YouTube Music. "RUDE!," released in February this year, has crossed 100 million music-video views and 250 million streams. The group has claimed nine number-one slots on South Korean music broadcast programmes, collected ten industry awards in 2025, and added a further eight by July 2026. As of 13th July, Hearts2Hearts counts 3.17 million YouTube subscribers, 5.18 million Instagram followers, 7 million TikTok followers, and 1.92 million paid members on Weverse, the K-pop fan platform.
The trajectory is already visible in SM's financial projections. Hana Securities forecasts SM's operating profit for the second quarter of 2026 at approximately 53.8 billion won (roughly $39m), citing expanded activity from NCT WISH, aespa, RIIZE, and Hearts2Hearts as key drivers. Samsung Securities similarly expects the momentum led by Hearts2Hearts and other junior acts — alongside aespa, RIIZE, and NCT WISH — to continue through 2026. In short, a group that has barely completed its first year of activity has already secured a place in SM's medium-term growth narrative.
In the news: a hit album and an airport controversy
The group's second mini-album, "Lemon Tang," released on 22nd June, sold 592,312 copies in its first week — a half-million-seller by industry reckoning and the best debut-week figure Hearts2Hearts has posted to date. It topped the Circle Chart's weekly retail album rankings and ranked second among fifth-generation girl groups by first-week sales. The title track simultaneously reached number one on both the weekly K-pop chart and the rising chart of QQ Music, China's dominant streaming platform. The album also entered the Billboard Japan Top Album Sales chart at number nine and reached 181st on the Billboard Global 200 (excluding the United States). Britain's NME observed that Hearts2Hearts was building a distinctive identity of its own, even as it carries forward the lineage of SM's storied girl-group tradition.
Yet rapid success has brought complications. In June last year, footage circulated online showing a security guard grabbing a fan by the neck and striking their face with an elbow during a departure at Incheon International Airport, South Korea's main international hub. The incident triggered a sharp public debate about excessive use of force. SM defended the guard's actions as a response to repeated physical contact by an obsessive fan — a persistent problem for high-profile K-pop acts — but the fan in question disputed that account on social media. A separate incident at Gimpo Airport in March of the same year, in which fans and security staff became entangled and disrupted other travellers, had already attracted public criticism. Together, the episodes exposed a gap between the scale of celebrity the group has achieved and the infrastructure in place to manage it safely.
The road ahead
The central challenge for Hearts2Hearts is, paradoxically, managing the pace of their own success. Within roughly eighteen months of debuting, the group has become a half-million-seller, built a multinational fanbase, and begun contributing meaningfully to SM's financial results. Yet the two airport incidents suggest that the safety and fan-management systems behind the scenes have not kept up. For acts that attract large, passionate followings at an early stage, failures in crowd management tend to reflect directly on the label's reputation — making this a priority for SM that rivals the music itself in urgency.
For SM, Hearts2Hearts is more than just a promising newcomer. The group is a test case for the company's strategy of reducing dependence on any single act in the wake of aespa's dominance. With aespa, RIIZE, and now Hearts2Hearts all growing simultaneously, SM is constructing a more balanced portfolio of younger artists. A multinational boy group, reported under the working name SMTR25, is also expected to debut in the second half of this year. Against that backdrop, the critical question for investors is whether Hearts2Hearts can convert early signals — a chart-topper on QQ Music, a foothold on the Billboard Japan rankings — into reliable recurring revenue from overseas markets. The answer will have a direct bearing on how the market values SM in the years ahead.