South Korean boy group, Cortis, returned on May 4th with their second EP, GREENGREEN, which is the six-track follow-up to their 2025 EP, COLOR OUTSIDE THE LINES. Their debut project introduced a group that seemed much more interested in playing around than settling into one polished sound, and GREENGREEN doesn’t abandon that instinct. If anything, it feels like Cortis are getting more comfortable within their experimentation!
The EP moves through hip-hop, electronic pop, trap, and grittier alternative elements without the shifts between them feeling random. There’s a playful, slightly chaotic quality tying most of it together: strange synths, heavily processed vocals, repetitive hooks, and little production choices that make several songs feel like they could be part of the soundtrack of a video game. The first four tracks are especially energetic before “Wassup” slows things down and “Blue Lips” allows the project to end on a much softer and more reflective note.
The first track, “TNT,” is a smart opener because it grabs your attention immediately. There’s something about its bouncy, bratty energy that makes me picture an early-2000s teen movie – specifically one of those school scenes where everybody is moving through the hallway while the main characters cause chaos in the background. It also feels unmistakably like Cortis. Rather than using their second EP to suddenly become more serious or polished, they carry over the youthful energy that made COLOR OUTSIDE THE LINES so fun.
“REDRED” pushes that energy further. Rough synth textures and a repetitive rhythm give it a vivid, almost game-like sound, while the song’s message is more purposeful than its noisy production would initially have you believe. Red represents the habits and ideas Cortis want to move away from, while green represents the direction they actually want to follow. It’s a simple concept, but one that fits a group whose identity has been built around resisting creative boundaries.
My biggest standout, though, is “ACAI.” Alongside “REDRED,” it was the song that gave me exactly what I had hoped to hear from Cortis after enjoying their debut EP so much. Inspired by the members’ real-life love of açaí bowls, the track is silly without feeling disposable. Its eccentric beat, vocal effects, and playful outro are all part of the appeal. Cortis are good at sounding like they’re genuinely having fun making music, and “ACAI” captures that better than almost anything else here.
Meanwhile, “YOUNGCREATORCREW” is probably the EP’s most experimental song. Cortis had already previewed the track months before GREENGREEN arrived, so I was curious to hear the finished version, and I wasn’t disappointed. The yodeling included within the track is immediately ear-catching, but it works because the rest of the song is already so strange. The vocals are heavily processed, the electronic production feels distorted, and the whole thing sounds like something the sleep paralysis demon inside a fever dream would dance to. It’s ridiculously catchy!
With these being the first four tracks of the EP, it’s safe to say that much of GREENGREEN is intentionally loose and unserious. Personally, I’m fine with that. Not every song’s lyrics need to rival Shakespeare, and sometimes music can simply sound good and be fun to dance to.
Still, as I was listening, I couldn’t help thinking I’d love to hear them pair more of their experimental production with deeper writing in the future.
“Wassup” and “Blue Lips” show that they can. The former drops into a more hypnotic, mid-tempo trap atmosphere while looking at how their daily lives have changed since their debut, even slipping some group-specific memories and jokes into the writing.
“Blue Lips” is easily the strongest lyrical moment on the EP and its clearest tonal shift. The hazier production and lower-key delivery give the words more room to land as the song deals with the exhaustion, uncertainty, and emotional scars that can come with chasing a dream – a subject matter many people can relate to, conveyed beautifully through lyrics such as:
“Dreams feel elusive, but what else do we got?”
“Still racing life’s clock, wanna change the views, I need something else and a new why,”
And “Chasing magic, but my feet tired,” which is a simple lyric, but it says plenty.
Overall, I wouldn’t call GREENGREEN a dramatic evolution from Cortis’ first era, but I don’t think it needs to be. The growth they’ve shown since their debut has been more about sounding increasingly sure of what kind of artists they want to be than turning into something entirely different. I’d say they accomplished that through this EP. The project is cohesive, weird, energetic, and very Cortis.
For listeners who enjoy production-first K-pop that’s playful, electronic, and willing to get a little strange, GREENGREEN is an easy recommendation. “ACAI” and “REDRED” remain my favorites, but the real highlight is hearing Cortis keep experimenting without softening the edge that makes them interesting.
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