1. Heroine: Su Yao, the concubine of Dingguo Houfu. Her biological mother died young. She was bullied by her aunt and sister since she was a child, but she is tough, kind and smart. Because of his extraordinary medical skills by chance, he was selected into the palace to treat the Queen Mother, thus entering the center of palace power. She has outstanding talents, is proficient in pharmacology, has a heart for the common people, and is determined to use her own strength to benefit the people of the world.
2. Male protagonist: Jun Muyuan, the emperor of the Great Sheng Dynasty, a man of great talent, bravery and strategy. Since he ascended the throne, he has made every effort to consolidate the imperial power. He looks cold and majestic on the outside, but he is actually very affectionate and righteous in his heart. While getting along with Su Yao, he was gradually attracted by her kindness and wisdom, and he loved her wholeheartedly, and he did not hesitate to compete with all forces for her.
Su Wan: Su Yao's sister, the eldest daughter of the Hou family. She is beautiful, charming and willful. She is jealous of Su Yao's talent and framed Su Yao many times. She only wants to enter the palace and become a beloved concubine, and use her family's power to fight for power in the palace. Xiao Ziyan: The prime minister's daughter is very scheming and scheming. He was engaged to Jun Muyuan and was deeply in love with Jun Muyuan. He regarded Su Yao as a thorn in his side and wanted to get rid of Su Yao and regain Jun Muyuan's love by any means.
Chu Yichen: The son of General Zhenyuan, he is free and uninhibited and has strong martial arts skills. He has known Su Yao since childhood and has a deep love for Su Yao. After learning that Su Yao had entered the palace, although he was in great pain, he still silently guarded her and helped her many times at critical moments. Jun Muyu: The younger brother of the current emperor, Prince Ning. He seems cynical, but in fact he is ambitious and covets the throne. Taking advantage of Su Wan and Xiao Ziyan's hostility towards Su Yao, they provoked disputes in the harem in an attempt to profit from it and subvert Jun Muyuan's rule.
