Kim Jae-hyun Steals the Show in The Absolute Value of Romance as the Charming No Da-ju

N.Flying’s Kim Jae-hyun is delivering 200% character synchronization in Coupang Play’s newest teen drama — and viewers are already obsessed.

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N.Flying’s Kim Jae-hyun is already turning heads — and winning hearts — in the new Coupang Play series The Absolute Value of Romance. With just four episodes released, Kim Jae-hyun’s portrayal of the multilingual, mood-maker teacher No Da-ju has quickly become one of the most talked-about performances of the show, proving that his transition from K-pop idol to drama leading man is nothing short of compelling. If you’ve been wondering whether The Absolute Value of Romance deserves a spot on your watchlist, Kim Jae-hyun’s performance alone makes it unmissable. Here’s everything you need to know about his standout role and why expectations for his full-scale performance are already through the roof.

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What Is The Absolute Value of Romance?

The Absolute Value of Romance is a Coupang Play original teen series that blends romance, comedy, and school drama into one irresistible package. The show follows Yeo Eui-ju (played by Move to Heaven and Alienoid star Kim Hyang-gi), a high school girl who writes BL novels featuring handsome male teachers — only to find herself living out her own turbulent story when four impossibly charming teachers are newly appointed to her school, Murim Girls’ High School.

The series premiered on April 17th and releases new episodes every Friday at 8 PM KST exclusively on Coupang Play, making it one of the most anticipated K-drama drops of the week for diaspora fans globally.

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Who Does Kim Jae-hyun Play in The Absolute Value of Romance?

In the series, Kim Jae-hyun plays No Da-ju, a foreign language teacher at Murim Girls’ High School and the self-proclaimed mood maker of the group. No Da-ju is impressively multilingual — teaching Japanese to second-year students and English to first-year students — and carries himself with a relaxed, confident ease that immediately makes him magnetic on screen.

But it’s not just his linguistic skills that set him apart. No Da-ju is also revealed to be the one who brought all the handsome teachers together under one roof — quite literally. He owns the house where his fellow teacher colleagues live, a detail that adds both comedic depth and an intriguing power dynamic to the story. His bickering chemistry with housemates, particularly his habit of casually emphasizing his homeowner status at every inconvenient moment, has already become a fan favourite running gag in the early episodes.

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Kim Jae-hyun’s 200% Character Synchronization — Here’s Why It Works

From the moment Kim Jae-hyun appeared on screen, it was clear this was a role built for him. His bright, cheerful energy maps onto No Da-ju’s extroverted personality so naturally that it’s difficult to imagine anyone else in the role.

What makes his performance particularly impressive is the layered subtlety he brings to what could easily have been a one-note “fun teacher” character. In front of students, Kim Jae-hyun channels a relaxed authority — confident but never stiff. Off the clock, he lets No Da-ju’s more playful, emotionally transparent side shine through micro-expressions and physical comedy that feel entirely unforced.

For an actor making his drama leading-man moment, this level of character synchronicity is rare — and viewers have noticed. Fan communities on X (formerly Twitter) and online K-drama forums have been buzzing about Kim Jae-hyun’s screen presence since the premiere, with many noting that he commands attention in every scene he’s in.

🔗 Internal Link: New to N.Flying? Read our N.Flying artist profile and discover why this band has one of the most loyal fanbases in K-rock.

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Kim Jae-hyun: From N.Flying to K-Drama Leading Man

For fans who know Kim Jae-hyun primarily through N.Flying, South Korea’s beloved rock band known for hits like Fly Away and NOW — this drama role marks an exciting new chapter in his creative journey. Kim Jae-hyun has long been celebrated for his expressive performance style on stage, and it’s that same instinct for emotional storytelling that translates so powerfully to the screen.

His casting in The Absolute Value of Romance signals a growing trend of K-pop and K-rock artists making confident, critically noticed moves into acting — a transition that Urban Asian has been tracking closely across the industry.

 

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What to Expect From Kim Jae-hyun in The Absolute Value of Romance Going Forward

Episodes 1–4 have only scratched the surface of what No Da-ju’s storyline holds. With Yeo Eui-ju’s fictional BL world beginning to blur with reality, and four teachers all occupying different emotional dynamics with her, the drama promises deeper character development, unexpected romantic tension, and plenty more comedic gold.

For Kim Jae-hyun, the real test — and the real opportunity — lies ahead. As the plot deepens, so will No Da-ju’s complexity, and based on what we’ve seen so far, Kim Jae-hyun has every tool to deliver a performance that goes well beyond the charming first impression he’s already made.

Expectations are high. Something tells us he’s ready for it.

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Watch The Absolute Value of Romance

📺 The Absolute Value of Romance is streaming now on Coupang Play, with new episodes every Friday at 8 PM KST.