Li Nan, a rural girl, went to the city to set up a street stall to sell handmade jewelry in order to collect tuition fees. She used her talent of humor to resolve troubles such as the urban management making things difficult and customers bargaining for prices. During a misunderstanding, she amused Huang Mengqi, an executive of a listed company, with the funny line "This hairpin can make you turn around more times than I have set up a street vendor." Huang Mengqi took a fancy to her "funny negotiation power" and invited her to join the company as a salesperson. From then on, Li Nan used the crooked trick of "making Party A laugh so he can sign the contract" to deal with business problems such as infighting in the workplace, pressure from competitors, and difficulties from major customers. For example, he spilled coffee on the contract and drew "lucky graffiti" to make Party A feel funny, and used "Your conditions are stricter than my mother's marriage" to resolve the harsh terms. Huang Mengqi changed from a "cold trader" to a "funny partner". The two complemented each other. From a new salesperson to founding his own company, he used humor to turn his opponents into subordinates and became a "living legend" in business wars.