As the secret guardian of the Empire's magic core, the talented female commander Astraea is forced by her duties to cut off her love and break up with her lover, the Empire's strongest soldier, Les. Three years later, a mysterious dark force invaded the borders of the empire. Ancient alliances were torn apart and the empire was in danger. Astraea was forced to step out of the background and go to the front line as the top military advisor, only to find that she was commanding the ace army "Scorching Sun" led by her ex-boyfriend Les.
One is arrogant and conceited and regards feelings as a weakness; the other is sunny and uninhibited and vows to get back his old love. The two were forced to cooperate on the smoke-filled battlefield. The sweetness and pain of the past were intertwined, and conflicts continued. Les used his unyielding and enthusiasm to melt Astraea's frozen heart time and time again, and Astraea gradually revealed to him the heavy secrets she was carrying.
As the investigation deepens, they discover that this crisis is far from a simple alien invasion. Behind it involves the power struggle in the kingdom, darkened old friends, and the prince of a neighboring country who has a pathological possessiveness towards Astraea. Astraea must make a choice between her mission to protect the empire, the easing of family ties, and the rekindled love. Together with Les, she fights her way out of the fog and achieves a true "reunion."
