Olive Young Gangnam collagen masks with 6,927 reviews! BIOHEAL BOH's 「콜라겐 리모델링」 line: mask, serum, cream. Look for 「콜라겐」. Tap 📍, then Directions🌙 #biohealboh #collagenmask #gangnamseoul How to pick ✔️ The serum gel mask comes single or in packs: 6,927 reviews, 4.8. Probioderm collagen serum (30ml, 3,601 reviews) is carry-on OK. Add the Probioderm cream: 1,747 reviews, 4.8. Gangnam stores: Central Gangnam Town (강남대로 403, B1–4F) and Gangnam Town (강남대로 429, 1–3F), 10:00–22:30; Sin-Gangnam (봉은사로2길 31) till 23:00. The same line has a serum gel mist (3,154 reviews). Getting there: tap 📍 for the store map, pick a Gangnam Olive Young, then Directions for the subway or bus from your hotel and where to get off. Collagen eye patches: 60 sheets, 1,780 reviews, 4.8.