Overdose Donut & Coffee is a donut shop near Exit 7 of Ttukseom Station in Seongsu, Seoul, selling handmade donuts and coffee. Its filled donuts include Jeju matcha and salted caramel and milk cream, and the dough is soft and chewy. The shop makes its own cream early each morning and discards unsold items the same day. Flavors can sell out, so reserve before going.