You probably know him as the guy with the piercing hazel eyes who played a robot in Are You Human Too? or the brooding second lead in Cheese in the Trap. But if you're searching for a seo kang joon song, you're likely tripping over a common misconception. Is he a singer? An actor who sings? Or just a guy who happened to be in a group that didn't actually do much singing?
Honestly, the "actor-turned-singer" pipeline is a cliché in Korea. Seo Kang Joon is different. He actually started in a group called 5urprise.
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Most K-pop groups are singers who try to act. 5urprise was the opposite. They were five actors—Seo Kang Joon, Gong Myung, Kang Tae-oh, Lee Tae-hwan, and Yoo Il—who were marketed as a "singer-actor" group. They released some tracks like "From My Heart," but let's be real: the music was mostly a vehicle for their acting careers.
The One Track You’re Actually Looking For
If you’re hunting for a specific seo kang joon song that actually showcases his voice, you’re almost certainly looking for "You Are My Love." This wasn't some random K-pop bop. It was Part 9 of the Are You Human Too? OST (Original Soundtrack). It’s a ballad. It’s soft. It sounds exactly like the kind of song a handsome robot would sing to a human if he had a soul.
He’s got this breathy, baritone-adjacent quality. It’s not powerhouse vocals like a Chen from EXO or a Jungkook, but it’s emotive.
I think that's why it stuck. Most actors do OSTs as a fan service. For Kang Joon, it felt like an extension of his character, Nam Shin III. When he sings "You are my love" in that slightly hesitant, airy tone, it hits differently because you've spent sixteen episodes watching him learn what love is.
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Fan Meetings and the "Hidden" Covers
You won't find a full-length solo album. Sorry to break it to you. But he’s performed quite a bit at fan meetings, and that’s where the "real" vocal gems are.
He’s a massive fan of piano. He actually played the piano himself in Cheese in the Trap. Because of that, his live performances often involve him sitting at a grand piano, looking like a prince, and covering songs that fit his vibe.
- "Falling Slowly" (from the movie Once): He’s covered this at several fan meets, including the "Last Charm" tour in Manila and Bangkok.
- "Thinking Out Loud" by Ed Sheeran: He did a version of this that went semi-viral in the fandom because his English pronunciation was surprisingly decent.
- "Every Day, Every Moment" (Paul Kim): This is a staple for every Korean actor who can hold a note, and Kang Joon's version is particularly stripped-back.
He isn't trying to be a pop star. He’s an actor who uses music to connect with people. There’s a big difference.
Why Does This Matter in 2026?
We’re sitting here in 2026, and Seo Kang Joon has just made his big post-military comeback with Undercover High School. People are rediscovering his old work. When a new generation of fans sees him as Jeong Hae-seong, they go down the rabbit hole.
They find the 5urprise clips. They find the old OSTs.
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The search for a seo kang joon song usually comes from a place of "Wait, he can do that too?" It’s part of the "Seo Kang Joon Effect." He’s visually stunning, he’s a top-tier actor, and then you find out he can play Chopin on the piano and sing a ballad that makes you want to cry. It's almost unfair.
The Realistic Discography
If you want to build a playlist, here is the actual, verified list of what exists. Don't go looking for 5-minute EDM tracks.
- "You Are My Love" (Are You Human Too? OST) - This is the definitive solo track.
- "From My Heart" (with 5urprise) - The 2014 debut. It’s very "classic K-pop ballad" style.
- "Hey U Come On" (with 5urprise) - A bit more upbeat, used for their After School: Lucky or Not drama.
- "Shake It Up" (5urprise) - This was their Japanese debut. It's... energetic.
Most people ignore the group stuff and stick to the solo OST. It’s better. It ages better.
Actionable Next Steps for Fans
If you're genuinely trying to hear the best of his voice, stop searching for "albums" on Spotify. They don't really exist in a traditional sense. Instead, do this:
- Check YouTube for "Seo Kang Joon Fanmeeting Live": Specifically, look for the 2019 Manila or Bangkok footage. The audio quality isn't studio-grade, but the raw emotion in his covers of "Falling Slowly" is far better than his over-produced group tracks.
- Watch the Are You Human Too? Music Video: The official MV for "You Are My Love" uses scenes from the drama. It provides the context that makes the song work.
- Listen to the When the Weather is Fine Soundtrack: While he doesn't have a vocal track on this one, he plays a character who is so intrinsically linked to the quiet, acoustic vibe of the OST that listening to it feels like watching his performance.
He’s an actor first. The music is a gift he gives to the fans. Enjoy it for what it is—a soft, sincere glimpse into the man behind the characters.