Lin Wantang, the descendant of the hidden medicine valley "Qingqiu Valley", was married to Chu Yanchuan, the Duke of the North, as a contract wife because of his proficiency in the medicine of strange poisons. There was a tit-for-tat confrontation at first. Lin Wantang uses his poisonous tongue and medical skills to slap his green tea cousin in the Duke's palace and make things difficult for the maid, and helps Chu Yanchuan solve the poisonous plot of his political enemies, gradually showing his extraordinary qualities; Chu Yanchuan turns from being exploited to being felled, and protects him in a domineering way. The two of them move from contract to sincerity amidst family hatred and world disputes, and finally resolve the crisis and achieve a successful harvest.
