From 'Ripped Taecyeon' to 'Northern Duke': 18 years of K-pop's 'beast idol' lineage

A strange new word surfaced in the K-pop industry in 2008: "jjimseungdol," a portmanteau of the Korean words for "beast" and "idol."

"Few things have shaken up the visual paradigm of boy groups quite like the word 'jjimseungdol,'" said an official at a major entertainment agency.

That assessment holds up. Through the mid-2000s, the K-pop boy group market ran on a default of pale-skinned, doe-eyed youths projecting the image of romance-comic protagonists wrapped in an air of mystery. Into that market stepped a wave of second-generation boy groups leading with raw, untamed masculinity and explosive physical energy — and the landscape flipped.

These groups discarded the polished, doll-like image entirely. By bringing sweat-soaked roughness and overwhelming physicality to the stage, they carved out an entirely new category in Korean pop. The "beast idol" lineage has now stretched across 18 years, evolving and reinventing itself with each passing era.

Trace the origins of the beast idol and you arrive at 2PM. Scoring hits one after another — "10 Out of 10," "Again & Again" and "Heartbeat" among them — the group transplanted raw, wild masculinity onto music show stages.

"Heartbeat," in particular, completed the grammar of 2PM as beast idols. The chest-pounding choreography and the moment member Taecyeon tore open his own shirt — a move that became known as "Ripped Taecyeon" — stand as some of the most viscerally striking images in the history of Korean idol performance.

2PM's signature combined high-difficulty tumbling and acrobatic choreography, sharply defined muscular physiques, and a bold, direct masculine charisma that delivered messages of pursuit without hesitation. Their masculinity was rooted in a primal, unrefined energy.

Beast (BEAST), a second-generation group that emerged around the same time, carved out its own lane as an "emotional beast idol" by weaving in lyricism.

Beast's defining tracks — "SHOCK," "Breath" and "Fiction" — layered aching vocals and heart-piercing melodies over intense electronic sounds and powerful synchronized choreography. Performed amid heavy eye makeup, black leather costumes and dramatic laser effects, the group's stage presence painted a portrait of a man wounded by heartbreak and loss, staking out territory no one else occupied.

MBLAQ, which debuted in 2009, brought yet another dimension. Produced by singer Rain, the group led with an urban, cool-edged wildness. Through styling — clothing, accessories and overall visual presentation — MBLAQ turned the beast idol into a visual character.

The restrained yet razor-sharp choreography in tracks such as "Y" and "War" (전쟁이야), movements evoking combat sports, and dark concepts drawn from ninja and villain archetypes were distinctly MBLAQ's own. Their interpretation of the beast idol offered an early glimpse of K-pop male idols merging with high fashion.

As K-pop entered the third-generation era in the 2010s, the beast idol gradually faded. "Refreshing idols" — clean-cut, boyish and approachable — took their place, with slim pretty-boy looks, precision choreography and a friendly-guy-next-door concept becoming the dominant mode. Monsta X, which debuted in 2015, was virtually alone in keeping the beast idol tradition alive.

"The idea that a boy group had to be made up of slender pretty boys took hold after the third generation, and by the fourth and fifth generations there was an unwritten rule that every debut had to be 'refreshing,'" an entertainment agency official said.

While most groups abandoned wildness in favor of a more docile image, Monsta X went in the opposite direction entirely — the one group that not only preserved the beast idol heritage but actively developed it.

Through tracks such as "HERO," "DRAMARAMA" and "Love Killa," Monsta X built its signature around an upper-body physique honed through serious training and the impeccable suit silhouette that showed it off to maximum effect.

Where second-generation beast idols leaned into exposure and raw animalism, Monsta X refined the concept into what fans came to call "grown-up sexy" — an appeal that drew in female fans well into their 30s. Blending hip-hop-rooted, hard-hitting sound with a solid physical presence, Monsta X served as the decisive bridge that kept the beast idol legacy alive and carried it forward to the next generation.

Marking their 11th debut anniversary this year, Monsta X continues to evolve the concept. The unit duo of Shownu and Hyungwon offered a preview of their direction when they released their second mini-album "LOVE ME" in May, saying they had "tried to express restrained exposure and sexiness."

The group that opened a new era for the beast idol — just as it seemed on the verge of disappearing — was ATEEZ. Debuting in 2018, ATEEZ grafted a fully developed fictional universe onto the beast idol template, a prerequisite for fourth- and fifth-generation groups, and expanded a familiar keyword into an entirely different dimension.

For ATEEZ, physicality was never simply a means of showing off the body. The "TREASURE" series built a narrative of pirates and explorers setting out to find the treasure within themselves; "FEVER" explored the burning restlessness of youth; and "THE WORLD" constructed an expansive fictional universe centered on rebellion against a controlled society.

The beast idol aesthetic of ATEEZ — led by member San (Choi San) — was not manufactured through agency storytelling but grew from an organic narrative. It found explosive synergy when it merged with the "Northern Duke" archetype from romance-fantasy web novels and webtoons.

Fitted sleeveless tops that suggested muscle without overexposure, precisely executed chest-pop choreography, high-fashion branding and memes that spread through short-form algorithms all combined to generate a global following that transcended both generations and borders.

A somewhat different strain of beast idol also exists. Enhypen pursues a seductive romance narrative that fuses vampire dark fantasy with lethal physicality.

Through stages for "Bite Me," "Sweet Venom" and other tracks, Enhypen has consistently emphasized a sharp aura and restrained physical lines concealed beneath a slender, fine-featured elegance. Moving between the grace of a pretty boy and the lethal edge of something wild, Enhypen represents the most polished and darkest variation of the fourth-generation beast idol. The group recently teased a comeback built around the concept of "untamed wildness," raising expectations for yet another new chapter in the beast idol lineage.