In Seongsu, go to Daiso Seongsu 2-ga (106 Seongdeokjeong-gil) or Ttukseom Station (6 Achasan-ro), both 10am–10pm. The divided magnetic basket is ₩2,000 (10K orders), good for toothbrushes and pens. Seongsu has lots of concept stores, so pop in after. No glue, so no marks when you take it off.
