In the web novel "Solo Leveling," the protagonist's guild, known as the Hunters Guild, plays a crucial role in the story. It serves as a community for hunters to band together, share information, and take on missions to combat monsters and protect humanity. The guild provides resources, support, and opportunities for growth and development for its members, including the protagonist, Sung Jin-Woo. Throughout the story, the Hunters Guild becomes increasingly important as they face more significant threats and challenges.