In the days when the seven great houses thrived under the benevolence and protection of the Big Dipper, those gifted with the energy of the stars had become rare. Remarkably, Haeseong of the Tae family and Giyeon of the Cheon family are born in the same era.

Driven by curiosity and rivalry toward another “heir of the stars,” the two join the same sect to train. One day, Giyeon is attacked by a mysterious assassin, and with Haeseong’s help, narrowly escapes. Realizing that the enemy’s target is the heirs of the stars, the two begin to grow closer as they protect each other…