Su Wantang, an apprentice in cultural relic restoration, fell in love at first sight with top lawyer Gu Huaichuan. For ten years, he accompanied her silently as a "substitute" and endured his indifference and neglect. Because Gu Huaichuan lost Bai Yueguang (actually Su Wantang's lost twin sister) in childhood, he regarded the similar-looking Su Wantang as his emotional sustenance, but he never dared to face his true feelings. It was not until Su Wantang died of lung cancer due to long-term exposure to harmful substances in cultural relic restoration that Gu Huaichuan discovered the truth about Bai Yueguang and his deep love for Su Wantang. He regretted it and tried to save it, but in the end he watched Su Wantang pass away with regret. For the rest of his life, he could only guard her cultural relic restoration shop amid guilt and memories, and died alone.
