In the Republic of China era, in Haicheng, Chen Ansheng returns from studying abroad and enters Haicheng Harbor in search of her younger sister. There, she crosses paths with Du Ansheng, the young marshal of the Du family who holds real power. What begins as a contractual bond gradually develops into mutual understanding and love. Amid the chaos of war, although the two are contract lovers, their feelings grow stronger through intense emotional struggles. However, family conflicts and the infiltration of foreign hostile forces follow one after another. The unexpected death of her younger sister leaves them caught between conflicting loyalties and emotions. Through the rise and fall of an era marked by separation and reunion, they remain committed to their original aspiration of saving their country, holding fast to their beliefs and kindness in turbulent times and demonstrating the courage and sense of responsibility of young people in a troubled world.