# Udon restaurant in Dongjak: cold tenbukkake vs warm kitsune at Kosi

- By Myeongju (https://superchart.com/en/@bell-side-seoul/)
- Written Sep 5, 2026
- Local places › Restaurants › Dongjak, Seoul
- Sponsored: This post was written as part of a paid store-visit sponsorship.
- English edition: https://superchart.com/en/@bell-side-seoul/kosi-isu-tenbukkake-kitsune-udon/
- Also in: [한국어](https://superchart.com/ko/@bell-side-seoul/kosi-isu-tenbukkake-kitsune-udon/index.md)

## In short

Kosi Isu Branch (코시 이수점) is a Japanese restaurant serving house-made udon and hand-breaded tonkatsu in an alley by Exit 9 of Isu Station in Dongjak, Seoul. On a hot day the writer ordered both a cold tenbukkake udon (11,000 won) and a warm kitsune udon (11,000 won), each set with inari sushi and cabbage salad, and found the shrimp and sweet pumpkin tempura thinly battered and plump inside. Kosi Isu Branch is a good pick when you want to taste a cold and a hot udon side by side in one sitting.

## Good to know

- **Bukkake udon**: 9,000 won
- **Toriten bukkake udon / Kitsune udon / Ebi tempura udon / Maze udon**: 11,000 won each
- **Tonkatsu / Cheese katsu / Mixed katsu**: 11,500 / 12,500 / 14,500 won
- **Beef bowl, katsu bowl, karaage bowl**: 10,500 won each
- **Sides**: Inari sushi 2,000 won, shrimp tempura 2,000 won (1 piece), tempura 5,000 won
- **Ordered on this visit**: Tenbukkake udon 11,000 won, warm kitsune udon 11,000 won
- **Hours**: 11:20–15:20 / 17:00–21:00 (last order 14:50 / 20:30, with a break between)
- **Parking**: 1 hour free in the building's underground lot
- **Ordering**: Tablet ordering at every table
- **Freebie**: One canned drink for writing a Naver receipt review
- **Price reference**: ₩11,000 ≈ $8.2 (2026-09-15)

*as written by the visitor on Sep 5, 2026*

![A table spread of udon and tempura at Kosi Isu Branch](https://img.superchart.com/images/kosi-isu-tenbukkake-kitsune-udon/kosi-isu-tenbukkake-kitsune-udon-01-b20da-1200.webp)

There's a surprising amount of food along the alleys near Exit 9 of Isu Station, and I finally came back to a go-to spot for when I want something light like udon or tonkatsu. Kosi Isu Branch is known for house-made udon noodles and hand-breaded tonkatsu, and on a muggy hot day I made sure to eat plenty of cold udon.

## Where is Kosi Isu Branch, and which Isu Station exit?

Kosi Isu Branch is close to Exits 7, 8, and 9 of Isu Station. Naver Maps points you to Exit 9, but the elevator there is under construction right now, so I'd recommend coming out Exit 7 or 8 and walking around instead. It sits just off the main road down a quiet alley, which makes the Kosi alley feel even calmer.

![Exterior of Kosi Isu Branch in an alley near Isu Station](https://img.superchart.com/images/kosi-isu-tenbukkake-kitsune-udon/kosi-isu-tenbukkake-kitsune-udon-02-161vy-900.webp)

![Entrance of Kosi Isu Branch in a quiet alley](https://img.superchart.com/images/kosi-isu-tenbukkake-kitsune-udon/kosi-isu-tenbukkake-kitsune-udon-03-13xnv-900.webp)

The wooden sign and soft lighting give it the feel of a udon shop tucked into a back alley in Japan, so the exterior alone sets a good mood.

![Wooden sign and soft lighting at Kosi Isu Branch](https://img.superchart.com/images/kosi-isu-tenbukkake-kitsune-udon/kosi-isu-tenbukkake-kitsune-udon-04-1u352-900.webp)

![Sign at the entrance noting house-made noodles](https://img.superchart.com/images/kosi-isu-tenbukkake-kitsune-udon/kosi-isu-tenbukkake-kitsune-udon-05-17lw7-900.webp)

Right at the entrance a sign reads "house-made noodles." They say the dough is made with just salt, water, and flour, aged for over two days, and freshly rolled out every day. With a phrase like "the slower it is, the better the flavor," you can tell this is a place that's serious about its noodles.

## Inside Kosi Isu Branch: seating for solo diners and groups

![Wood-toned, softly lit interior of Kosi Isu Branch](https://img.superchart.com/images/kosi-isu-tenbukkake-kitsune-udon/kosi-isu-tenbukkake-kitsune-udon-06-g2b7z-900.webp)

![View of the table seating at Kosi Isu Branch](https://img.superchart.com/images/kosi-isu-tenbukkake-kitsune-udon/kosi-isu-tenbukkake-kitsune-udon-07-gsen1-900.webp)

![Group seating area at the back of the restaurant](https://img.superchart.com/images/kosi-isu-tenbukkake-kitsune-udon/kosi-isu-tenbukkake-kitsune-udon-08-e4bfi-900.webp)

Inside, the wood tones and soft lighting make Kosi Isu Branch comfortable and cozy even for solo dining. There's also seating for groups, so it works well for nearby office workers or gatherings too. Ordering is done via tablet at each table, which makes things easy.

## Kosi Isu Branch menu and prices

* Don't forget — writing a Naver receipt review gets you a free canned drink :)

![Kosi menu board listing cold udon, hot udon, and tonkatsu](https://img.superchart.com/images/kosi-isu-tenbukkake-kitsune-udon/kosi-isu-tenbukkake-kitsune-udon-09-1uam7-900.webp)

The menu has quite a range: cold udon, hot udon, kama udon, tonkatsu, and rice bowls. 👇 Here's the lineup:

- Bukkake udon ₩9,000
- Toriten bukkake udon ₩11,000
- Kitsune udon ₩11,000
- Ebi tempura udon ₩11,000
- Mazesoba udon ₩11,000
- Tonkatsu ₩11,500
- Cheese katsu ₩12,500
- Mixed katsu ₩14,500
- Beef bowl · Katsu bowl · Karaage bowl ₩10,500 each
- Sides – Inari sushi ₩2,000, shrimp tempura ₩2,000 (1pc), tempura set ₩5,000

The tonkatsu is famous too, but this time I went with two bowls of udon. (Something about that day just made me crave noodles.)

![Tenbukkake and kitsune udon served together as one meal](https://img.superchart.com/images/kosi-isu-tenbukkake-kitsune-udon/kosi-isu-tenbukkake-kitsune-udon-10-1wyib-900.webp)

![Udon spread with inari sushi and cabbage salad on the side](https://img.superchart.com/images/kosi-isu-tenbukkake-kitsune-udon/kosi-isu-tenbukkake-kitsune-udon-11-1nnxi-900.webp)

Tenbukkake ₩11,000, kitsune udon (hot) ₩11,000. Both came with inari sushi and cabbage salad on the side, making for a very filling spread. We're not exactly light eaters, but the portions were big enough that we were completely stuffed by the end.

![Warm kitsune udon topped with thick fried tofu](https://img.superchart.com/images/kosi-isu-tenbukkake-kitsune-udon/kosi-isu-tenbukkake-kitsune-udon-12-yb79l-900.webp)

### Warm kitsune udon (udon with sweet fried tofu)

First, kitsune udon — think of it as fried tofu udon. Thick pieces of fried tofu sit on top, soaking up the broth so each bite is moist. The broth, made from anchovy, kelp, and bonito, is mild but deeply savory. Completely ideal when you're craving a warm bowl of soup udon to soothe your stomach.

![Close-up of broth-soaked fried tofu in kitsune udon](https://img.superchart.com/images/kosi-isu-tenbukkake-kitsune-udon/kosi-isu-tenbukkake-kitsune-udon-13-156ia-900.webp)

![House-made udon noodles lifted with chopsticks](https://img.superchart.com/images/kosi-isu-tenbukkake-kitsune-udon/kosi-isu-tenbukkake-kitsune-udon-14-14g4b-900.webp)

Maybe because it's house-made, the noodles are on another level. Plump and springy, they get chewier the more you chew — the kind of texture that keeps pulling you back in (like Shrimp Crackers?). The noodles alone were tasty enough that I kept slurping them up before they went soft.

![Bowl showing the plump texture of the udon noodles](https://img.superchart.com/images/kosi-isu-tenbukkake-kitsune-udon/kosi-isu-tenbukkake-kitsune-udon-15-1cxgx-900.webp)

![Tenbukkake udon topped with shrimp and sweet pumpkin tempura](https://img.superchart.com/images/kosi-isu-tenbukkake-kitsune-udon/kosi-isu-tenbukkake-kitsune-udon-16-bdhj7-900.webp)

### The main order: cold tenbukkake udon with tempura

And now the main event of the day — tenbukkake! Big shrimp and sweet pumpkin tempura sit on top of cold noodles, with grated radish, lemon, scallion, and seaweed on the side. You pour the special soy-based sauce over it and mix everything together. Cold noodles are especially fitting in summer, and the distinct aroma and seasoning of this tsuyu sauce were outstanding *_*

![Cold udon served with grated radish, lemon, scallion, and seaweed](https://img.superchart.com/images/kosi-isu-tenbukkake-kitsune-udon/kosi-isu-tenbukkake-kitsune-udon-17-mlr3v-900.webp)

![Tenbukkake udon with special soy sauce poured over it](https://img.superchart.com/images/kosi-isu-tenbukkake-kitsune-udon/kosi-isu-tenbukkake-kitsune-udon-18-1ftfi-900.webp)

After pouring the soy sauce and lifting the noodles, the cold strands are springy and bouncy through and through. The seasoning isn't too strong, so the natural flavor of the house-made noodles really comes through. The inari sushi that came alongside was seasoned just right too — a solid fix for a carb-loving nation's cravings.

![Cold noodles lifted up after mixing in the soy sauce](https://img.superchart.com/images/kosi-isu-tenbukkake-kitsune-udon/kosi-isu-tenbukkake-kitsune-udon-19-1hri4-900.webp)

![Cross-section of thin-battered shrimp tempura](https://img.superchart.com/images/kosi-isu-tenbukkake-kitsune-udon/kosi-isu-tenbukkake-kitsune-udon-20-n4wls-900.webp)

![Close-up of plump shrimp tempura](https://img.superchart.com/images/kosi-isu-tenbukkake-kitsune-udon/kosi-isu-tenbukkake-kitsune-udon-21-1s4p0-900.webp)

![Inari sushi served alongside the tempura](https://img.superchart.com/images/kosi-isu-tenbukkake-kitsune-udon/kosi-isu-tenbukkake-kitsune-udon-22-hv486-900.webp)

The tempura on top of the tenbukkake was genuinely, seriously crunchy, and packed inside. Shrimp tempura these days can honestly be disappointing a lot of the time, but the shrimp meat here was so plump it made me gasp — totally satisfying!! The batter is thin and not greasy, so there's no heaviness and I just kept picking pieces up. I wanted to eat it while it was still crispy, so I went straight for the tempura first, no hesitation ^^

## Cold udon vs warm udon at Kosi Isu Branch: the verdict

I got to enjoy cold tenbukkake and warm kitsune udon together, two bowls with very different personalities. The house-made noodles were clearly a cut above, and the tempura and sides made it a satisfying meal overall. If you're craving udon or tonkatsu around Isu or Sadang, I'd recommend this as a light, easy option.

## Hours, break time and parking at Kosi Isu Branch

Kosi Isu Branch is open 11:20–15:20 and 17:00–21:00, with last orders at 14:50 and 20:30. There's a break time in between. The building's underground parking lot is free for 1 hour.

## Where it is

- Kosi Isu Branch (코시 이수점)
- 1F 126, 127, 300 Sadang-ro, Dongjak-gu, Seoul, South Korea
- 서울특별시 동작구 사당로 300 1층 126호, 127호
- 37.4844642, 126.9808303
- Google Maps: https://www.google.com/maps/search/%EC%BD%94%EC%8B%9C%20%EC%9D%B4%EC%88%98%EC%A0%90/@37.4844642,126.9808303,17z

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Superchart · https://superchart.com/en/@bell-side-seoul/kosi-isu-tenbukkake-kitsune-udon/ · https://superchart.com/llms.txt