When her cousin Zhou Ze is preparing for his wedding, Gu Min is misunderstood by her family over a 3,000-yuan contingency fund, and wedding planning is handed over to Xu Meng instead. In pursuit of low prices and free resources, the new plan encounters one problem after another, including booking mistakes, absent staff, additional charges, and chaos at the venue. Gu Min insists on following the contract and respecting everyone's responsibilities. At critical moments, she still provides the necessary assistance, helping Zhou Ze and Lin Na understand that what professional services truly offer is preparation, accountability, and security. After the wedding, the family reviews all the accounts and finally understands the importance of boundaries and rules.