She is Jiang Yi, a lowly palace medical maid. He is Cheng Ao, a general renowned for his military achievements. In her dream, she repays a debt of gratitude by pledging loyalty to the Third Prince, only to cause Cheng Ao's death. Before dying, he turns back to look at her and says, "A Yi, you trusted the wrong person." The gratitude she owed was nothing but a deception from beginning to end. When she awakens from the dream, his sleeping face is beside her pillow. He uses his military merits to ask the emperor for permission to marry her, yet she refuses to let him approach. None of it has happened yet. This time, she decides to protect only him.