Crayon Pop:

These five girls were chosen by their CEO to help fulfill a prophecy by protecting Girls' Generation.  They struggle to complete their duties and carry on somewhat normal lives at the same time.  Their music activities act as an alias, as well as a source of income, for them.

Girls' Generation:

The Nine have taken over so much of the kpop market, and the world market in general, that their album sales are the most stimulating transaction in the East Asian economy.  Even with political tension rising among the countries, no nation dares to attack another one for fear that SNSD albums will no longer be sold to them, causing their economy to collapse.  The stakes are high, but one group of terrorists is not affraid to do away with the reigning kpop group and cause international havoc.

K-Much:

These five men were chosen by Chrome's CEO in order to assist Crayon Pop on their mission, as their music activities have increased since Bar Bar Bar's release.

Kim Jaejoong:

He is so fabulous.