The final episode of the series airs on April 1.
The title song was composed by the same team that created Girls' Generation's 2015 summer hit "Lion Heart."
Nearly half of the shows's 101 girl group trainees will be eliminated.
The singer revealed her thoughts about leaving the K-pop group in a post on her personal blog.
The list shows some surprising trends about which groups are most popular in the K-pop world.
Sales for both albums and songs are counted from January 1st to the end of the first week of December.
Big Bang was the only idol group to make the list of Korean celebrities with the highest incomes this year.