Based on the provided reviews, the DIVE IN Low Molecular Hyaluronic Acid Toner by Torriden appears to be generally safe and beneficial for acne-prone skin with post-acne scars. Many reviewers with acne-prone and sensitive skin have reported positive experiences, noting that the toner is gentle, hydrating, and does not cause irritation or breakouts.

However, it's important to note that individual skin reactions can vary. Some users mentioned that while the toner is hydrating, it may not provide intense moisture on its own, especially for those with very dry skin or during winter months. In such cases, layering with a serum or moisturizer is recommended.

Additionally, a few reviewers with super sensitive skin experienced eye irritation when the product got near their eyes, suggesting caution around the eye area.

Overall, the toner seems suitable for acne-prone skin, but as with any skincare product, it's advisable to perform a patch test first to ensure compatibility with your skin.