Gilpost · Seongdong-gu, Seongsu-dong 1-ga
Noodle houseJapanese
Kosi Seongsu-jeom
코시 성수점 Koshi (こし) is the Japanese word for the firm, springy bite of noodles — the house makes its own Sanuki-style udon.
Compiled from 18 blog posts read in fullSources →
Kosi Seongsu is a ground-floor shop in an alley near Ttukseom Station serving Sanuki-style udon alongside pork cutlets. Posts list bukkake udon at 9,000 won, toriten bukkake at 11,000 won and a cheese cutlet at 12,500 won; turning udon into a set (+5,000 won) adds a 120 g cutlet, and turning a cutlet into a set (+3,500 won) adds a bowl of kake udon. Every main comes with an inari pocket and cabbage salad, and the bukkake sauce arrives on the side for you to pour. We read 30 posts dated 17 September to 5 October 2026; 18 of them are visits to this shop. We set aside 12: four about the Konkuk branch, one about the Seoul National University branch, two Albania travel posts, and five about other shops that only link to this one.
Data as of · Published ·
Location & hours
- Address서울특별시 성동구 상원1길 31, 1층 (성수동1가)31 Sangwon 1-gil, Seongdong-gu, Seoul
- Phone02-6465-9797
- Typical spend₩3,500 – ₩17,000
- From the station8 posts say it is walkable from the station.
- Floor areaFloor area 54 m² · Status In business
When it opens
Of 14 posts: 12 wrote Daily 11:00–21:00, 2 wrote 11:00–21:00.
| Daily | 11:00–21:00 | 12 of 14 posts |
|---|---|---|
| No day given | 11:00–21:00 | 2 of 14 posts |
| Break | 15:00–17:00 | 11 of 11 posts |
| Last order | 20:30 | 12 of 12 posts |
| Closed | None | 2 of 2 posts |
Counted from what bloggers wrote in their posts; we did not confirm it with the restaurant. Where the values differ, it may be a change over time rather than a disagreement, so we show when each one was written.
What sets it apart
- Expect a line at mealtimes. Five posts waited or saw a queue; one walked straight in at dinner. A writer on their fourth visit put the average wait at 5–10 minutes; others found a line at 2 p.m. on a Saturday and a short one at weekday lunch from nearby office workers. Four posts describe a sign-up list outside the door — one says you write your name and party size on paper, another that there is no Naver reservation or Tabling app.
- There are both counter seats and tables: seven posts say so, one listing four-tops, two-tops and a bar. A solo diner liked the row of single counter seats, so no one has to take a four-top alone.
- The room is small: three posts say so — two call it compact, one says tables are close together at the dinner peak. No post about this branch calls it roomy.
- You order from a tablet at your seat, as seven posts note. One mentions English, Japanese and Chinese buttons; another describes a video about the noodles and stock playing on the screen (the shop's own claims, which we do not count).
6 more
- Nine posts say the portions are large or left them very full; one self-described big eater was glad not to have ordered an extra side.
- Eight posts call the frying crisp, often noting it arrives hot; one says the tempura doesn't go soggy even on top of the udon, another that the cutlet is served on a rack to keep the underside dry.
- Four posts say it isn't salty, since the sauce comes separately and you add your own. One writer poured it all in at once and found it a bit salty — hence the repeated advice to add it gradually.
- Five posts mention a review event; posts received a vegetable fritter and two lotus-root skewers, and one says it is one per person rather than per table.
- It's close to the subway: eight posts say it's an easy walk. Two give 2–3 minutes from Ttukseom Station exit 6, one says 2 minutes from exit 2, and one walked about 10 minutes from Seoul Forest Station.
- Four posts went alone, three with friends, two with a partner, one with family and one as a group of three. A solo diner noted that so many others were eating alone that it felt completely comfortable.
What 18 bloggers said
yubu chobap
Large portions
We read all 18 in full. The most common claims are “Large portions” (9) and “Crispy batter” (8).
What they liked
What they struggled with
Things you can check on site
- Seats to sit and eat 9 of 18 posts
- Reachable by transit 8 of 18 posts
- Has tables 7 of 18 posts
- Self-order screen 7 of 18 posts
- Review event 5 of 18 posts
- Origin labelling posted 3 of 18 posts
- Large windows 3 of 18 posts
- Parking capacity 2 of 18 posts
- Open kitchen 2 of 18 posts
- Free refills 1 of 18 posts
- Phone charging 1 of 18 posts
- Signed celebrity photos 1 of 18 posts
- Beer served 1 of 18 posts
These are raw counts, not percentages. Someone who did not mention something is not someone who disagreed.
Parking
2 posts say you can park. None say you cannot.
| Posts saying you can park | 2 of 18 posts |
|---|
Don't count on parking. Two posts looked at the spaces out front and disagree on the number — two cars versus up to three. The first found a bin on one side and the waiting list and queue on the other; the second also says the line makes parking hard and suggests the subway. Other posts' 'two spaces in front' is copied listing text, and one info box says no parking.
Who came, and with whom
- Solo visit 4 of 18 posts
- With a friend 3 of 18 posts
- Date 2 of 18 posts
- Came with children 1 of 18 posts
- Family visit 1 of 18 posts
- Group visit 1 of 18 posts
Where it is
We could not find this shop’s own listing on Naver Map, so the link searches for its Korean name around this spot instead.
From the station
It's close to the subway: eight posts say it's an easy walk. Two give 2–3 minutes from Ttukseom Station exit 6, one says 2 minutes from exit 2, and one walked about 10 minutes from Seoul Forest Station.
Getting inside
| Toilet inside | yes 0 · no 1 (of 18 posts read) |
|---|
No post describes the floor from experience; only the address says ground floor, and no one mentions stairs, a basement or an upper level.
We don't know whether there is a step at the entrance or whether a wheelchair or stroller can get in. One post went with a child but said nothing about the entrance — that means no one wrote about it, not that there is a barrier.
The toilet is outside the shop. One post describes it from experience: out the door, around to the right at the alley entrance, with the door code posted beside it — awkward with a child. Another post's info box says the same. No one mentions whether it is separated by sex.
No one mentioned: Second floor · In a basement · Lift to the floor · Ramp at the door · Step at the entrance · Step-free access · Accessible toilet · Separate restrooms. That is not the same as there being none — it means we could not confirm it. Worth calling ahead, and do tell us: we will put it here.
How to read these posts
- Someone else paid1 of 18 posts
- Posts saying they paid themselves5 of 18 posts
- Posts saying nothing either way12 of 18 posts
When the posts appeared
Month by month
| Month | Posts |
|---|---|
| 2026-09 | 9 |
| 2026-10 | 9 |
What we do not know
- Fourteen posts give the same hours — daily 11:00–21:00, break 15:00–17:00, last order 20:30 — but all copied from the listing. Two say there is no closing day, and one notes the afternoon break applies on weekends too.
- Prices come from posts dated September–October 2026; the loin cutlet (11,500 won), half-and-half cutlet (13,500 won), maze udon and katsudon (11,000 won) were copied from the listing by one post. As examples of a meal, two people paid 32,000 won for two sets, and a solo diner paid 18,000 won for udon with an extra cutlet and a drink.
- Ten of the visit posts give the phone number 02-6465-9797. Reservations are unclear: two copied info boxes say Naver booking is available, but one visitor wrote that there is no Naver booking or Tabling, only the list at the door.
- Of the 18 visits, one discloses receiving the meal from the shop. Another follows a templated checklist format, so we counted only what the writer actually experienced. Hearsay (a baseball player's visit, the Konkuk branch being the original) and the ingredient claims on the ordering screen are repeated text, not counted.
Sources (18)
Every number above was counted from the posts below.
- 성수 돈까스 맛집 뚝섬역 맛집 아기랑 같이 가면 좋은 점심식당 코.... 2026-10-05 · 맛집탐방 쿠키로그
- 코시 성수 돈까스 맛집 토리텐우동과 모듬카츠 먹어본 후기 2026-10-04 · 조에의 밸런스드라이프
- 코시 성수 돈까스 맛집 뚝섬역 자가제면 사누키 텐붓카케 우동 일식 2026-10-03 · 다 먹는 블로그
- 뚝섬역 돈까스 맛집 <코시> 쫄깃한 사누끼 붓카케우동에 입덕함 2026-10-02 · 굴굴이네
- [맛집/뚝섬] 쫠깃탱탱 우동 & 바삭촉촉 돈가스 뚝섬 성수 맛집 추천 .... 2026-10-02 · life_yammy
- 성수 맛집 코시 | 인생 붓카케우동과 서울숲 돈까스 맛집 솔직 후기(.... 2026-10-02 · 날아라 부엉이의 인생 리뷰
- [성수 돈까스 맛집] 코시 : 치즈카츠와 우동 먹으러 재방문 예정 2026-10-02 · 花朝月夕
- [성수] 돈까스 우동 맛집 코시, 생등심 돈카츠까지 바삭했어요 2026-10-01 · 빛나는 하루
- 코시 성수점 뚝섬역 쫄깃한 수제 우동면과 돈가스 내돈내산 후기 2026-10-01 · 밍닝일상
- [코시 성수점] 성수 서울숲 돈까스 맛집(치즈카츠,마제우동) 2026-09-30 · 진뜩한 보리의 댕댕로그
- 성수 돈까스 맛집 코시 성수점, 뚝섬역 우동까지 맛있는 가성비 밥.... 2026-09-29 · 복덩이가 되자~♥
- 성수 돈까스 맛집 코시 성수점 다녀왔어요 2026-09-28 · helloworld_21
- 성수 코시 ｜ 쫄깃한 붓카케우동과 돈카츠 내돈내산 2026-09-28 · 테리의 스마트홈과 미식 라이프스타일
- 서울숲 돈까스 맛집 코시 성수점 생등심 치즈카츠에 니꾸우동까지 2026-09-28 · 프로 사부작러 토리의 이모저모
- 뚝섬역 돈까스 맛집 | 코시 성수점 | 바삭한 돈카츠와 쫄깃한 냉우동.... 2026-09-28 · ⠀
- [성수/뚝섬 맛집] 쫄깃한 자가제면 우동, 성수 돈까스 맛집 '코시 성.... 2026-09-27 · 빛나는 꾸✨
- 뚝섬역 돈까스 맛집 코시 성수점, 사누키우동에 고구마 고로케까지 .... 2026-09-27 · 덤보로그 | 세상의 모든 꿀정보
- 뚝섬역 돈까스 맛집 코시 성수점｜성수 팝업 투어 후 혼밥하기 좋은 우동·일식 맛집 2026-09-21 · The Note by YS. · via Daum
Of 308 candidate posts we opened 56 and kept 18 as evidence. We stop once 30 are confirmed: beyond that the counts grow in proportion without changing the answer.