Wikipedia ( http://en.wikipedia.org/wiki/Hwarang ) :  "The Hwarang, or "Flower Boys",^[1] were an elite group of male youth in Silla, an ancient Korean kingdom that lasted until the 10th century. There were educational institutions as well as social clubs where members gathered for all aspects of study, originally for arts and culture..."

KPOP idols don’t seem normal; in fact they are not normal.  They are all in a system of protecting Korean (and other selected countries) Lands.  Hwarang (for males) and Wonhwa (for females) work together to expel “evil” and induce “good” throughout the globe.  Disguised as idols, they could travel all over the world, stopping evil.  Originally founded from the Silla Dynasty, this group of warriors had continued in secret.  And yes, Secret is a part of Wonhwa.

Sometimes, order isn’t a certain thing… especially as the cover world (idol world) becomes more competitive.  As the tensions between clans (each company) increase, the reported clans also increase.  Now there is an unknown force that is breaking some groups apart, and creating scandals.

All of the idols must cooperate to solve this problem, and defeat the evil force.  At the same time, they must keep their Hwarang/ Wonhwa identity secret, no matter on the situation.