- Female protagonist: Su Qingyuan (modern)/Shen Mingwei (ancient), 23 years old, master of traditional Chinese medicine in a modern tertiary hospital. She is good at acupuncture and medicinal diet. She has an independent and sober personality. She has a slight social fear but is very principled. After traveling through time, she became the concubine of the Minister of Rites of the Dajing Dynasty. Her biological mother died young and she was bullied by her aunt and sister. She has a reputation as a "father-killer".
- Male protagonist: Xiao Jingyuan, King Jing, the God of War of the Dajing Dynasty, 26 years old. He has great military exploits but is feared by the emperor due to old injuries on the battlefield (damaged heart and hidden leg problems). On the surface, he is cold and taciturn, not close to women, but in fact, he is thoughtful, affectionate and protects his own shortcomings. He secretly investigates the secrets of the royal family and the truth about his own old injuries.
- World view: The Great Jing Dynasty (similar to the fusion background of the Tang and Song Dynasties), where culture was valued over martial arts but there were constant wars on the border. The conflicts between the aristocratic families and the imperial power were sharp, the medical level was backward, witchcraft and medicinal food culture were prevalent, and there were foreshadowings related to the "time and space rift" (the reason for the heroine's time travel).
