Myeongdong has two Daiso stores: Myeongdong Main (43 Myeongdong-gil) and Myeongdong Station (134-1 Toegye-ro), both 10am–10pm. Staying near Myeongdong Station? That one's closer. For tea bags, Boseong solomon's seal tea is ₩1,000 for 12 (4.6K+ orders), a nutty tea that makes an easy gift.