My Empress Sibling sells veggies

Twenty years ago, Liu Guihua, a farm woman, lost her son Zhizhou while saving the Fifth Prince. Two decades later, the prince became emperor and found Guihua and her daughter being bullied. He brought justice and helped locate Zhizhou, now living with the Bai family in Jiangnan but suffering from memory loss. Guihua uncovered the Bai's abuse of Zhizhou and their daughter Bai Yun, leading to danger due to the influence of Bai Yun's lover's father, a powerful minister. The emperor intervened, saving them. When Ning Wang rebelled with foreign aid, Zhizhou, revealed as a disciple of the top martial arts sect, regained his wits and skills after a head injury, defeating the rebels. The emperor rewarded Guihua's family with titles for their kindness.