Wei Funing, an orphan from the border, concealed her daughter's identity, disguised herself as a guardian of the Jiaofang, and rushed to the capital with a blood letter from all the people, just to overturn the case of her master who was wronged and died in the war. She not only has to protect her junior sister who is in a difficult situation, but also has to fight against the ruthless prince and the ambitious lady in white. She also has to test and pull each other with the gentle and deep Cui Xuanyu. When a disaster breaks out at the birthday banquet, she holds the old military flag to save people and unexpectedly finds the late emperor's secret scroll. Half of the jade pendant hides her life experience, and the fate of fifty thousand border troops depends on her. All the officials in the dynasty sought advantages and avoided disadvantages, but she was the only one who stepped into the dangerous court hall alone and worked hard to seek justice for the loyal and good.