Chu Yunge, the daughter of a general's household, and Imperial Prince Li Yunchen know and accompany each other, giving rise to deeply rooted affection amidst the passing years. The two pledge their hearts to one another and set a marriage vow to stay together, looking forward to accompanying each other year after year with a grand wedding procession in the future. However, the ambitious Prince Ning, Li Chengze, covets the succession and secretly lays down heavy plots and schemes. Beacon fires rise across the northern border, and Li Yunchen is entrusted with a critical mission to rush to the frontier, only to be framed and plotted against by a traitor, heroically dying a martyr for his country on the battlefield. When the tragic news reaches the capital, Chu Yunge puts on bright red bridal robes and ascends the city tower, rushing to meet her vow with her beloved in a resolute manner.