Gen, Explained: How K-Pop Sorts Its Idols Into Five Generations

In May, K-Pop Atlas tried to pin down when K-pop's 5th generation began and came back with an honest shrug: there is no official starting date. "Gen" is fan shorthand for generation, the era a K-pop act belongs to based on when it debuted, and the usual count runs to five, from the 1990s pioneers to the groups debuting since 2023.

That missing date says a lot about the word. K-Pop Atlas wrote that fans and critics hand out generational labels after the fact, once a pattern becomes obvious. Fashionchingu's guide put it more plainly: most of the time, fans are the ones who decide a new era has started.

What it means

Gen is short for generation, and it travels with a number: 1st gen, 2nd gen, 4th gen, or spelled out, "fifth gen." Medium writer Imogen Law describes each generation as a wave of artists molded by the business practices, sounds and technology of its moment.

Fashionchingu built its map from popular opinion rather than any official ruling, and gave each era a nickname:

• 1st gen, 1990s to 2004: "Laying the Foundation"
• 2nd gen, 2005 to 2011: "Training System & Testing the International Waters"
• 3rd gen, 2012 to 2017: "Global Power & Domination"
• 4th gen, 2018 to 2022: "The Future of KPOP"
• 5th gen, 2023 to present: "New Era"

The word has spin-offs, too. Aidolhouse uses "bridge groups" for acts that debuted a little early but plainly shaped the 5th gen's sound and attitude. Imogen Law adds two more: "overlap," for the stretch when several generations are active at the same time, and "turnover," the speed at which a new generation becomes the industry's dominant force.

What separates one gen from the next is a change in sound, look and concept. Fashionchingu wrote that a new generation needs a few distinct resets in music, visuals and concept.

The 4th-to-5th handoff is the freshest example. K-Pop Atlas calls the 4th gen maximalist, heavy on elaborate world-building and dense production, and says the 5th gen often leans toward softer textures, quicker hooks and a look closer to everyday life. Aidolhouse comes at the same split from another angle: 4th gen groups were all about performance and precision, and 5th gen groups come across as looser and easier to approach.

The label describes, but it is also contested by design. Fashionchingu noted that fans argue over which generation a given idol or group belongs to, which is why it went by popular opinion.

Where it came from

Nolae dates the generational count to 1992. That year, according to Bandwagon, Seo Taiji and Boys debuted on a talent show with "I Know." The trio split in 1996, and member Yang Hyunsuk went on to found YG Entertainment.

The Los Angeles Film School calls Seo Taiji and Boys the first band that looks like K-pop and its mega fandom as they exist now.

The idol system came next. Bandwagon wrote that SM Entertainment formed H.O.T. in 1996, that most people credit them with starting South Korea's boyband craze, and that their disbandment was announced in 2001. SidusHQ formed g.o.d, short for Groove OverDose, in 1999, and the group picked up the nickname "Nation's Idol."

Imogen Law credits SM's early idols, among them H.O.T., S.E.S. and Shinhwa, with powering the 1st gen's rise. Law also attached numbers to it: by her count the 1st gen held an 89% share of sales by 1999 and began to slip when the 2nd gen debuted in 2003. The 2nd gen took a 58% majority in 2005, then held between 85% and 100% of the market from 2006 to 2012.

The borders were fuzzy from the beginning. Fashionchingu runs the 1st gen through 2004. Nolae says it ended in 2003, the same year Law gives for the 2nd gen's debut.

After that, the clock sped up. Nolae wrote that generations have gotten shorter since the first one. Law found that the early eras changed slowly, with long stable stretches, while newer waves rise and peak far faster. By Nolae's account, general opinion puts the start of the 5th gen just four years after the 4th began.

Fashionchingu's nicknames trace the push abroad, from the 2nd gen testing international waters to the 3rd gen's global power. One date on that road for American fans: The Los Angeles Film School wrote that BTS gave their first-ever U.S. performance on the AMA stage on Nov. 19, 2017.

Nobody officially issues the labels. Nolae wrote that the start of a new generation follows no official rules.

Why it's having a moment

The live argument is where the 5th gen begins. Aidolhouse wrote that some fans start it in late 2022 and others in 2023, and it sided with 2023. Nolae credits ZEROBASEONE with launching it once COVID-19 pandemic restrictions ended, but notes that quite a few fans insist the 4th gen is far from over, while K-Pop Atlas, in its May 27 explainer, named RIIZE, BABYMONSTER and ILLIT as the clearest early examples.

How to use it (and how not to)

Gen works as a quick timestamp for a group, and often as an opening bid in a debate. A few lines a fan might actually say:

• "ILLIT debuted in March 2024, so they're 5th gen."
• "H.O.T. and S.E.S. are 1st gen. That's where SM's idol story starts."
• "Call it 5th gen if you want, I don't think 4th gen is over yet."

The friendly use is descriptive. It lands wrong when someone treats a placement as settled fact: K-Pop Atlas says the 5th gen has no official start date, Nolae says there is no rulebook, and even Fashionchingu's chart is popular opinion.

When a group sits right on the line, Aidolhouse's "bridge group" is the diplomatic option: an act that debuted a bit early but helped shape the new sound.