A. 1. Inspect the product: Before using, carefully inspect the product for any signs of tampering or prior use. If you notice anything unusual, do not use the product. 2. Report the issue: Document the signs of prior use with photos and report the issue through the customer service channels on the Korean Skincare website.

B. 3. Request a replacement: If the product is confirmed to be used, request a replacement or refund according to the return policy outlined on the website.