ILLIYOON is a South Korean skincare brand under Amorepacific, launched in 2017 with a focus on effective, pharmaceutical-grade solutions for dry and sensitive skin. Its signature Ceramide Ato Concentrate line uses a multi-ceramide barrier complex intended to provide long-lasting hydration for face and body, including for infants and eczema-prone skin. The brand emphasizes minimal, fragrance-free, and hypoallergenic formulations.