Thirty years ago, Shen Yunheng dropped a small portrait at a palace banquet, and Prince Ning fell in love at first sight and asked for her hand in marriage. However, her father Shen Huaijin, eager to cozy up to the Prince's Mansion, locked his legitimate daughter in the west courtyard and ordered his concubine-born daughter Shen Yunqi to assume her identity and marry in her place. Shen Yunheng was wrongly married to the profligate Gu Sanlang and died of illness with unredressed grievances. Thirty years later, Shen Yunheng's daughter, Shen Zhaoning, has firmly secured the position of Empress. Using the crown prince's concubine selection, she crosses out the name of the impostor's granddaughter with a vermilion brush, and step by step, using old files, eyewitnesses, and a blood-written letter, exposes the fake marriage scam in public at the Mid-Autumn palace banquet. The wicked are brought to justice, her mother is finally posthumously honored as Lady Zhenyi, reburied at Nanshan Mountain, and her name is rightfully restored.