Shen Changning, the Grand Princess of Great Yan who safeguards the nation, conquered six kingdoms on the battlefield. After her daughter was divorced and died from a massive hemorrhage, she shut herself away for fifteen years. When her granddaughter, Yao Yao, is insulted and called a bastard, Shen Changning comes out of seclusion once again to seek justice for her at a spring banquet in the imperial garden. She makes the Marquis's legitimate grandson kneel and apologize, and has the Marquis's wife divorced. She reopens the investigation into her daughter's old case, exposing the Xie family's deception of the emperor and bringing about their confiscation and exile. Xie Yanzhi puts righteousness above family loyalty, exposing his own family to protect his younger sister. Before Shen Changning breathes her last, she secures Yao Yao's future with a princess's fief, household guards, and powerful protectors. Eight years later, fifteen-year-old Yao Yao opens her grandmother's final letter and reunites with Xie Yanzhi. At her eighteenth birthday banquet, dressed in a striking red gown, she reveals an imperial decree left by the late emperor and carries on her grandmother's indomitable spirit.