K-Saju Crew is an entertainment project playfully interpreting saju-inspired signals for K-Pop roles. It allows friend groups to create a virtual K-Pop group by entering birth dates. A key design choice was to handle temporary group creation without persistent databases. Initially, the project maintained statelessness, but the group feature required temporary shared state. They opted for a hybrid model where a temporary lobby stores group data for 30 days. Once completed, a group generates a stateless, permanent permalink containing all input data. This permanent result URL allows for reproducible results and social sharing even after the lobby expires. The K-Pop casting and role assignments are determined by a deterministic engine for consistent results. Concurrency and abuse were managed through in-memory serialization and IP-based rate limits for the file system store. A stateless design also enabled the generation of durable social preview images using Satori. The separation of the temporary lobby from the permanent result was crucial for managing data retention and sharing.