Su Wantang, a wandering orphan girl, sneaked into the stables of Dingbei General's Mansion for a chance of survival. She accidentally activated the space of the portable medicine house and obtained the "Emperor Horse Medicine" and the thousand-year-old spiritual grass. From then on, she became a "horse doctor" who can cure horse injuries and understand the nature of horse training. General Xiao Chengyu of Dingbei was pressured by his political opponents due to the sudden death of three horses at the military horse farm. He reached a deal with Su Watang to "treat horses in exchange for food", but he was impressed after witnessing her using space spiritual grass to rescue the dying "Zhao Yebai". The Dachu Chunshou Polo Club is approaching, and Xiao Chengyu is asked to bring his family members to compete, and is forced to ask Su Watang to disguise himself as a man and play for him. On the field, Su Wantang passed three levels in a row with her space horse training skills, and even exposed her opponent's conspiracy to give chronic poison to the horse in public, while Xiao Chengyu rode his horse to block her when she was attacked by a hidden arrow, and the relationship between the two grew stronger amid the sound of horse hooves. In the end, Su Wantang won the championship with the double skill of "medicating horses + training horses". Xiao Chengyu took the opportunity to ask the emperor to marry her as his concubine. The newly sprouted "resurrection grass" in the Yaolu space was quietly paving the way for Xiao Chengyu's old wounds left on the battlefield.
