Revolves around an elite group of male warrior youth called Hwarang who grow through passion and love in Seorabeol, the capital of the ancient kingdom of Silla.

During the Kingdom of Silla, a group of elite youth known as Hwarang would wield great influence. These dashing, talented knights - Moo Myung (Park Seo Joon), Sam Maek Jong (Park Hyung Shik), Soo Ho (Choi Min Ho), Ban Ryu (Do Ji Han), Yeo Wool (Jo Yoon Woo), Han Sung (Kim Tae Hyung [BTS's V]), and maiden Ah Ro (Go Ah Ra) - could outsmart and outfight anyone as they pushed for justice in Seorabeol, the capital city. One of them would become King Jin Heung of Silla and change the course of history.