With the release of new idol groups every year, these K-pop groups are often divided into generations. These idol groups were separated into four generations in an attempt to classify them according to the characteristic of each era. Through the classification, netizens will be able to see a clear gradual change in the characteristics and evolution of Kpop.

One netizen started a discussion in an online community about the two songs that signaled the shift from the second generation to the third generation in the K-pop idol music industry.

The netizen picked EXO's "Growl" and TWICE's "Cheer Up" for the two songs that signaled the shift in the idol generation. 

The netizen picked EXO's "Growl" for the boy group songs as it caused a phenomenon in which most, if not all, male students were singing the song in school. TWICE's "Cheer Up" can be the song that made the girl group solidify their spot as one of the most popular girl group in K-Pop.

Netizens joined in the conversation as they commented, "I think it's only EXO's 'Growl' that signaled the shift, not TWICE," "When did we ever divide up the girl group and boy group generation shifts?" "I definitely agree that EXO led the opening to the third generation idol groups," "I definitely agree with EXO," "I think it's more accurate to say EXO's 'Growl' marks the change for all idol groups and TWICE's 'Cheer Up' only marks for girl groups," "The term between EXO's song and TWICE's song is too long," and "I was guessing it would be EXO's 'Growl.'"