Out of Order Seongsu (아웃오브오더)

Out of Order (아웃오브오더) is one of the hottest Korean fine-dining bars in Seongsu, occupying a moody second-floor space on Achasan-ro 13-gil that sits just above one of the neighborhood's most popular pork joints. The kitchen treats Korean food the way a top wine bar treats its by-the-glass list — playful, seasonal, and meant to be eaten in small, shareable plates. The menu changes regularly, but expect inventive takes on Korean dining staples — think reimagined pajeon, modern jeon, hanwoo dishes, and seafood preparations that draw equally from Korean and Western techniques. The vibe is decidedly bar-forward: low lighting, soft music, a thoughtful wine list, and a kitchen that turns out plates designed to be paired with a glass rather than wolfed down. Service runs in two clear shifts — lunch from 11:30 to 14:00, then dinner from 18:00 to 22:30 — which keeps the dinner crowd intimate and the kitchen sharp. With nearly 400 Google reviews at a 4.9-star average, Out of Order has built a reputation among Seongsu regulars as the place to go when you want Korean food that pushes a little harder than the neighborhood's usual gopchang and samgyeopsal options. Reservations through Catch Table are essential, particularly on weekends when the limited seats fill up days in advance.