Hello, thank you for leaving an honest review. May I ask which part you are referring to regarding the sale of a product? The AI tool in question is not a product sold separately; it is a learning tool I developed myself to be used for practice, similar to class materials. There are no additional payments or subscription fees beyond the tuition, and I personally cover all server and token costs required for its operation. If there is anything I missed or any other inconveniences you experienced, please let me know, and I will actively take them into account. Thank you. ++ Ki-woo Jung, it appears you haven't logged into the AI Agent yet. Have you watched the first lesson of the paid course, "How to Use the AI Agent"? That lesson explains how to download the AI Agent for free.