Kakao Entertainment's new band hrtz.wav have arrived with a debut that feels determined to introduce the group as more than a one-show success story. Their first mini album, The First Wave, is now out, led by the youth pop-rock title track "NINETEEN" and backed by a rollout that immediately pushes them toward live stages.
The five-member lineup was formed through Steal Heart Club, and the project carries that survival-show momentum into a proper band launch instead of a soft landing. Keiten on guitar, Hagiwa on drums, Dane on bass, Riaan on vocals, and Youn Young-jun on keyboard make up the team, with a Korean-Japanese mix that gives the group a naturally broader frame from the start.
A debut built around youth as a feeling
The First Wave is presented as a record about young emotions in motion: excitement, confusion, affection, heartbreak, and the strange electricity of starting something before you fully know what shape it will take. That is familiar territory in K-pop, but hrtz.wav approach it through band texture rather than glossy synth-pop polish.
The strongest idea in the release is that five distinct frequencies are meeting for the first time and turning silence into motion. It is a neat concept, but more importantly, it matches the band's name and the release itself well enough to feel like identity instead of branding homework.
Why "NINETEEN" makes sense as the lead
"NINETEEN" is the obvious headline track, and probably the right call. It leans into warm synth tones, bright guitar work, and forward-moving drums to capture that threshold feeling between adolescence and adulthood. The song is not trying to sound rebellious for the sake of it. It is aiming for something more emotionally recognizable: that suspended moment where everything still feels open, but nothing feels settled.
There is also a smart bit of authorship here. All five members participated in writing the lyrics, which gives the debut at least some claim to sounding like the people performing it rather than a ready-made concept dropped on top of them.
The EP's shape
The six-track EP rounds out its first impression with a full spread of youthful emotion. "Dream" is positioned as the rush of affection starting to build. "Highlight" pushes into breakup aftermath with a modern rock edge. "I AM SO FINE" stays in post-breakup terrain but with more groove and movement underneath the ache. "Outta my mind," which includes creative participation from Riaan and Dane, shifts toward dreamy young-love awkwardness. "Close To Me" reads like the opening page of the band's relationship with listeners.
That is a lot of emotional territory for one debut, but the upside is clear: the group is trying to introduce flexibility early. Rather than locking themselves into one mood, they are sketching a wider range and betting that the live-band setup will hold it together.
The real test starts on stage
This release is not being left to streaming alone. The band already held a debut showcase in Seoul on April 8, and next comes the first real public stress test: festival stages. They are set for Awesome Music Festival 2026 in Seoul on April 25 and 26, followed by KCON JAPAN 2026 in Chiba from May 8 to 10. There is also an upcoming OST contribution for the drama Perfect Crown, which suggests the rollout is designed to spread quickly across different parts of the market.
That matters because band debuts live or die on whether the performance side can make the record feel bigger. A good EP can introduce potential. A strong run of live stages makes people believe the group can actually carry it.
First impression
The First Wave does what a debut should do: it gives hrtz.wav a vocabulary. The members have positions, the record has a theme, the lead single has a clear emotional hook, and the next few dates on the calendar give the project momentum. The harder part comes after that, but this is a solid first step.
If hrtz.wav can turn their live presence into something as distinct as the concept they are introducing here, they will have a real chance to stand out in a scene that does not always make easy space for bands.
