Spoiler alert. Only one company had a negative net income in 2015.
The previous girl group to have such massive success was EXID, with their viral hit "Up & Down."
The Korean public's preference for girl groups has dropped significantly since 2010, when five positions on the list were filled by girl groups.
Sales for both albums and songs are counted from January 1st to the end of the first week of December.
The Korean and Mandarin versions of the album hold the top two spots on the Hanteo weekly album sales charts.