Two rookie girl groups. Two of the biggest agencies in K-POP. The same debut season. If you've been anywhere near K-POP fan spaces since 2025, you've seen Hearts2Hearts and KiiiKiii mentioned in the same breath — usually with someone trying to pick a winner. Here's the thing: they're not actually competing for the same fans, and knowing why will help you figure out which one (or both) is actually for you.
Hearts2Hearts (SM Entertainment) and KiiiKiii (Starship Entertainment) both debuted in early 2025 as their agencies' first new girl groups in years. Hearts2Hearts leans dreamy, polished, and nostalgic — a callback to SM's classic girl-group formula. KiiiKiii leans raw, playful, and internet-native — built for a generation that grew up on TikTok rather than music shows. Neither is "winning" in any settled sense; they're succeeding at different things.
Why Are These Two Groups Always Compared?
The comparison isn't random. Hearts2Hearts debuted on February 24, 2025 as SM Entertainment's first large-ensemble girl group in 18 years — since Girls' Generation — and its first new girl group at all since aespa debuted back in 2020. KiiiKiii, meanwhile, is Starship Entertainment's first new girl group since IVE debuted in December 2021. Both agencies were making a bet after a long gap, both groups debuted within weeks of each other, and Korean entertainment media couldn't resist a head-to-head narrative. Some fans and Korean netizens have pushed back on the framing as a manufactured rivalry — the groups themselves have said they see each other as motivation rather than competition.
aespa – "Next Level" – SM Entertainment – via YouTube
What Does Each Group Actually Sound and Look Like?
Hearts2Hearts' debut single "The Chase" is a chill, dreamy pop track, and the group's visual identity leans into a modernized Y2K aesthetic — pastel styling, cohesive color grading, and a "fairy-tale" polish that critics have compared to a spiritual successor of Girls' Generation and Red Velvet. It's meant to feel like a nostalgic, elevated version of the classic SM girl-group formula.
Hearts2Hearts – "The Chase" – SM Entertainment – via YouTube
KiiiKiii took a completely different approach with pre-release track "I DO ME" — a pop-dance song about trusting your own instincts, paired with a bold, unconventional rollout that skipped the usual teaser buildup entirely. Visually, KiiiKiii favors playful, vibrant styling and open, casual settings over polished sets, aiming for an unfiltered, Gen-Z-coded energy rather than a produced fantasy.
KiiiKiii – "I DO ME" – Starship Entertainment – via YouTube
Who's Actually Winning?
Depends what you're measuring. "The Chase" sold over 400,000 copies in its first week — the highest first-week sales of any girl group debut album on record at the time, according to Hanteo Chart data — and the song held steady on Circle Chart's monthly rankings from March through June without a sharp drop-off. "I DO ME," on the other hand, made a surprise entry at No. 13 on Melon's Hot 100 the day it was released, well before KiiiKiii's official debut, and topped YouTube's trending videos in Korea for two straight days. In brand reputation rankings for March 2025, KiiiKiii actually ranked No. 1 among rookie idol groups, with Hearts2Hearts in second place. So: Hearts2Hearts wins on raw sales and chart longevity; KiiiKiii wins on viral momentum and brand buzz. Different scoreboards, different winners.
Which One Should You Actually Follow?
If you gravitate toward polished, cohesive concepts and enjoy watching an agency execute a proven formula well, Hearts2Hearts is the easier entry point — it feels familiar even if you're new to K-POP. If you're drawn to groups that feel unpredictable, internet-first, and a little rougher around the edges, KiiiKiii will click faster. Neither requires picking a side against the other — plenty of fans follow both, and the "rivalry" framing matters a lot more to headline writers than it does to the groups themselves.
| Hearts2Hearts | KiiiKiii | |
|---|---|---|
| Agency | SM Entertainment | Starship Entertainment |
| Members | 8 | 5 |
| Debut single | "The Chase" (Feb 24, 2025) | "I DO ME" (pre-release, Feb 24, 2025) |
| Concept | Dreamy, polished, Y2K nostalgia | Playful, unfiltered, Gen-Z digital-first |
| Standout strength | Record-setting first-week album sales | Viral chart surprise entries, brand buzz |
| Agency's last girl group | aespa (2020) | IVE (2021) |
Don't judge either group off their debut single alone. Hearts2Hearts shifted toward a nostalgic third-gen-inspired sound with "Style," and KiiiKiii moved into city pop and retro synth territory with "Dancing Alone" — both groups changed direction fast in their first year. Check a group's second or third release before deciding they're "not for you."
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