Design the first slice of your AI penpal's knowledge vault — the real sources it will read from when a stranger talks to it at the Seoul Expo. Name 3–4 REAL sources you would ingest (for example: the Korea Tourism Organization website, Seoul Metropolitan Government transit pages, a reputable Korean-phrase reference, or your own persona sheet) — no invented sources. For each: (1) why it earns a place in the vault; (2) one question a visitor could ask that this source lets the penpal answer with confidence; (3) one question the penpal must refuse or flag as out of scope because no loaded source covers it (for example, "what's the wifi password at this booth?"). These are the first rows of the ≥15-source vault you'll assemble in the workbench.