The text discusses Riot Games Korea's transition to MongoDB Atlas for managing their massive PC bang game session data. The company, which handles 40 billion game sessions annually, had been using a relational database with limited scalability and flexibility. They partnered with MongoDB to create a more efficient system that could handle the increasing data volume and frequent schema changes. After migrating from AWS EC2-based MongoDB community version to MongoDB Atlas, they simplified cluster management, improved performance, and reduced downtime. The team also leveraged Atlas's automation features, such as automatic backups, query profiling, and performance advisor tools, to increase developer productivity and optimize database performance. By using MongoDB Atlas, Riot Games Korea aims to improve their game experience, reduce operating costs, and maintain a competitive edge in the Korean gaming market.