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A K-Pop column by the name of 'Idology' recently published a full timeline of K-Pop's generations, starting with the founder of the 1st-generation H.O.T all the way through the new wave of 4th generation idols.
In this timeline, 'Idology' categorizes the generations of K-Pop by creating sub-generations - the 1.5 generation, the 2.5 generation, and the 3.5 generation.
You can find 'Idology's full analysis of the generation timeline here.
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Damn, someone take me back to the "golden era" of kpop of 2009- SNSD, Big Bang, TVXQ, Shinee, 2pm, 2ne1, miss a, fx SUJU- damn, iconic songs were released that year!