1. Purpose These Terms of Service ("Terms") establish the rights, obligations, and responsibilities between BNZ Co., Ltd. ("Company") and users regarding the use of Questi and its related services.
2. Definitions a. "Service" refers to Questi and all related services accessible through various devices including PCs and smartphones. b. "User" refers to individuals who agree to these Terms and are categorized as:

• Non-members: Users accessing services without registration
• Regular members: Users with free membership
• Premium members: Users who have purchased paid service subscriptions c. "Content" refers to all forms of digital materials provided by the Company, including problem-solving resources, AI services, and workbooks. d. "AI Service" refers to AI-powered problem-solving and learning support services.

1. Service Details a. Services provided include:

• AI-powered problem-solving and explanations
• PDF workbook upload and management
• Learning analytics and management
• Additional learning support services

b. Service access by membership level: Premium Members:

• Unlimited access to AI problem-solving
• PDF workbook upload capability
• Access to all available workbooks

Regular Members:

• 5 daily AI problem-solving attempts
• PDF workbook upload capability
• Access to basic workbooks

Non-members:

• 5 daily AI problem-solving attempts