Li Surong married Captain Lu Zheng to repay a debt of gratitude. After three years of secretly being married, she discovers that her husband has always carried a torch for someone he could never have: his unattainable first love, who turns out to be none other than her paternal half-sister, Lin Zhenzhen. Li Surong decides to set Lu Zheng free so he can pursue his dream woman. But it is only after their divorce that Lu Zheng discovers his wife is actually an aerospace safety engineer, and that everything he has ever had was made possible by her.