"Start-Up" is a South Korean television series that revolves around the world of entrepreneurship and innovation. The story follows a group of young individuals who aspire to create successful start-up companies in the fictional Sandbox, a hub for aspiring entrepreneurs. The series explores their challenges, dreams, and relationships as they navigate the competitive landscape of the tech industry. The main character, Seo Dal-mi, is determined to make her mark in the start-up world, while Nam Do-san, a talented programmer, seeks to find his purpose. Together, they face various obstacles, including personal struggles and rivalries, as they strive to achieve their goals and build their futures.