In Myeongdong, there's Daiso Myeongdong Main Store (43 Myeongdong-gil) and

Myeongdong Station Store (134-1 Toegye-ro), both open until 10 pm. Popular numbers can sell out, so it's worth checking both. Holika Holika Softune Mood Palette No.01 Peach Melt is ₩5,000 with 6.3K+ orders.