K-pop groups are known for their high-energy performances, catchy music, and synchronized dance moves. But sometimes, the members of these groups want to explore different concepts and styles that might not fit with the image of their main group. That's where subunits come in.

Subunits are smaller groups made up of members from the same K-pop group. These subunits often have their own distinct sound, style, and concept that differ from the main group's image. This allows the members to experiment with different genres and showcase their individual talents in a new light.

Recently, K-netizens have been buzzing about the most successful girl group subunits of all time. These Korean netizens gathered in a popular online community where they were able to share their two cents on this very topic.

The discussion started with one netizen suggesting that SISTAR19 might be the best girl group subunit with many hit songs.

SISTAR19 - consisting of SISTAR's Bora and Hyolyn - made their debut in 2011 and gained attention for their sexy and confident performances, as well as their hit songs like "Ma Boy" and "Gone Not Around Any Longer."

While many other K-netizens agreed that they are the best subunit girl group, some gave other suggestions.

These netizens also brought up TaeTiSeo - a subunit of Girls' Generation consisting of members Taeyeon, Tiffany, and Seohyun - and Orange Caramel - a subunit of After School consisting of members Raina, Nana, and Lizzy.

Netizens commented, "I agree with SISTAR19," "SISTAR19's track was so good." "I think TaeTiSeo is a successful subunit too," "Orange Caramel did really well too," "I clicked on this post thinking about Orange Caramel," "I thought of TaeTiSeo," and "I think SISTAR19 was a really successful subunit but they had a similar concept with SISTAR, so I don't know if it would be considered a successful subunit."