Breakfast in Seongsu: Sandwich, Bagel and Brunch Places That Open Early

A cafe-bar on the second floor of 135 Achasan-ro: coffee and desserts by day, cocktails and highballs in the evening. DiningCode lists 12:00–23:00 daily with last order at 22:30, so it is closed in the morning and fits better into an evening plan. The signature item is "pigotchi", dried persimmon topped with cream cheese and pecans (₩10,000). It is about 170 m from Seongsu Station Exit 2.

A dessert cafe on the third floor of 3 Wangsimni-ro 4ga-gil, centred on tarts and ice cream such as a fig tart and a honey-fig ice cream (₩13,000 each). It opens after midday and runs to around 23:00, so it does not work for a morning plan. Posted hours and closing days vary widely between sources — read the tip below before going.

Blue Bottle's first cafe in Korea, opened 3 May 2019. It is the red brick building outside Ttukseom Station Exit 1 — the ground floor holds the roastery that supplies Blue Bottle's Seoul cafes, and the seating is one level below. Multiple sources note the seat count is small. The official site lists 08:00–20:00 daily.

A dessert cafe on the second floor of 6 Yeonmujang 5-gil. According to visitor reviews, the ground floor is a store of the cosmetics brand Dasique and the interior is pink-and-white marble. DiningCode lists 11:00–20:00 daily with last order at 19:00, so ordering stops an hour before closing. Individual cakes are listed at ₩14,000–₩16,000 and whole cakes at ₩55,000–₩59,000.