Line/Series Compatibility
Multiple buyers purchased this toner specifically to complement other ISOI products (serums, creams) they already owned, seeking synergistic effects from using the same skincare line.
Influencer & Celebrity Endorsement
Several reviews mention purchasing based on recommendations from Korean YouTubers, beauty content creators, and celebrity user Jang Soo Jin, indicating strong social-proof-driven acquisition.
Repurchase & Brand Loyalty
Numerous reviews indicate repeat purchases ("2nd bottle," "buying again for years"), reflecting high satisfaction and established brand trust among existing customers.
Sensitive Skin Needs
Buyers specifically sought this product for its reputation as low-irritant and soothing, targeting consumers with reactive or acne-prone skin types.
Post-Exercise Hydration
A distinct use case emerged where swimmers and athletes purchase this as a post-practice rehydration toner due to its intensive moisturizing properties.