Close-up portrait of a 20-year-old Korean idol with a gentle smile, dewy skin, holding a 120ml black glass bottle of hair essence oil near her cheek in her hand. Eyes without double eyelid, slightly larger, maintaining a balance between natural and expressive, matte mocha mousse lips, natural makeup, straight long dark hair. Soft, shiny, and healthy-looking hair with a natural glossy sheen, reflecting light gently. The strands have a smooth texture with a slight glossy finish, showcasing the hair's natural shine. The hair flows effortlessly with subtle light reflections, emphasizing its healthy and nourished appearance. Soft lighting, high fashion beauty photography, confident and composed expression, simple and clean fashion, minimal accessories, minimalistic yet classic background, sophisticated and timeless mood, ultra-realistic, 4K.