Su Lingxi, the eldest princess who was cherished by the late emperor, is ordered to marry Xiao Jinghan, the celebrated General Who Guards the North. Yet on her wedding day, she is cruelly pressured into accepting an outrageous marriage arrangement. The Xiao family relentlessly corners her, but clear-minded and resolute Su Lingxi refuses to compromise. In front of everyone, she tears up the absurd marriage agreement and boldly reclaims the imperial edict issued by the late emperor. Just as she reaches her darkest moment, Fu Jingxuan, the cold and ruthless Duke Who Guards the Nation, arrives amid the uproar to stand up for her, protect her, and sweep away every obstacle in her path.