kpop1-7, Exercise 2: Charts and chart manipulation

Model answer:

All-Kill: a song places first on all of South Korea's major music platforms' real-time charts at once.
Certified All-Kill: first on all platforms' real-time and daily charts.
Perfect All-Kill: first on real-time, daily and weekly charts - the highest achievement.
The Gaon Chart (launched February 2010 by the Korea Music Content Association) was rebranded as the Circle Chart on 7 July 2022, with a new Global K-pop Chart added.

Sajaegi (사재기) is chart manipulation by bulk purchasing of albums or using bots to boost streams. It has the potential to question the credibility of charts, so a number one is evidence of what the chart counted, not proof of how many people listened.

Sources: Wikipedia, K-pop (Record charts); Circle Chart.