Shen Qingci, the legitimate daughter of a marquis's household, was raised in the countryside. Upon arriving in the capital, she is publicly humiliated by the household's insolent servants. Unfazed, she strikes back on the spot, swiftly punishing those who dare defy their superiors and dazzling everyone with her first display of brilliance! Thanks to her exceptional medical skills, she strikes a mutually beneficial agreement with the Prince of Nanjing, who suffers from a strange and deadly poison. After moving into the prince's residence, she cleverly overcomes her half-sister's schemes and ingeniously resolves a citywide drinking water crisis. Step by step, she uncovers long-buried cases and clears the names of those who were wrongly accused. The decisive and ruthless prince protects her throughout. From relying on each other for mutual support to developing a deep understanding and affection, the two ultimately stand together to uphold justice and protect one another.