Write a persona spec for an AI agent that teaches introductory data analysis to teenagers (14–17) in Seoul, using real datasets. The agent helps students formulate questions about data, explore patterns, and communicate findings — but does not do the analysis for them.

Your spec should have:

1. Role — who is this agent? (Be specific: for what age, what skill level, what context?)
2. Voice — how does it speak? (Give 2–3 concrete examples of sentence patterns, tone, or how it handles specific situations.)
3. Boundaries — what will it refuse to do? (At least 3 specific refusals.)
4. Refusal behaviour — for each boundary, write the exact response the agent gives when it hits that refusal. Make it stay in character and offer a path forward.

Test your spec by writing one example exchange: a student request that hits one of your boundaries, followed by the agent's refusal response.

Deliverable: A persona spec (300–400 words) + one example exchange (50–100 words).