This document presents a brief for an online marketplace called Chợ Tốt seeking to recruit more sellers. It aims to attract 50,000 new sellers within 3 months by changing people's perception of the value of selling unused items. The target audience are 25-30 year old digitally native Vietnamese who are online daily and open to recommendations. The deliverable is a 10-slide presentation proposing a digital/social media campaign using up to 3 platforms, with an executive summary slide recapping the campaign, including the campaign summary, creative insight, solution and how it works.