Hongdae's other big stores, Olive Young Hongdae Town (57 Hongik-ro 6-gil) and

Hongik Univ. Station Store (LG Palace 1F, 156 Yanghwa-ro), open 10 am to 11 pm, better for evenings. The Dewytree 화장발 duo is 30+30 sheets (2K+ reviews), and SNP Gold Collagen Daily Mask has 30 sheets (520+). They hold essence, so big tubs go in checked baggage.