# Isu Station Japanese restaurant with a mini udon add-on: Kosi - By Seoha (https://superchart.com/en/@a-meal-break/) - Written Sep 17, 2026 - Local places › Restaurants › Dongjak, Seoul - Sponsored: This post was written after receiving a complimentary visit from the restaurant. - English edition: https://superchart.com/en/@a-meal-break/koshi-isu-commute-dinner-bukkake-udon/ - Also in: [한국어](https://superchart.com/ko/@a-meal-break/koshi-isu-commute-dinner-bukkake-udon/index.md) ## In short Kosi Isu Branch is a Japanese restaurant serving handmade-noodle udon and tonkatsu right by Isu Station in Dongjak, Seoul. A dual-income couple finishing work in Yongsan and Gongdeok met at Isu Station, split a tonkatsu and a bukkake udon (chilled udon with poured broth) half and half, and added draft beer plus a mini warm udon. For a light dinner with one beer on the way home, Kosi Isu Branch does the job. ## Good to know - **Location**: 1F, Units 126 & 127, 300 Sadang-ro, Dongjak-gu, Seoul (steps from Isu Station) - **Hours**: 11:00–21:00 (break 15:00–17:00) - **Signature menu**: Tonkatsu / cold udon / tempura and more - **How to order**: Kiosk at the entrance - **Set makeup**: Tonkatsu comes with inari sushi (seasoned fried tofu pockets); a mini udon can be added - **Payment**: Cards accepted - **Visited**: September 2026 *as written by the visitor on Sep 17, 2026* ## Why this working couple met at Isu Station after work Kosi Isu Branch is a tonkatsu and udon specialty restaurant right next to Isu Station, on the 1st floor of 300 Sadang-ro, Dongjak-gu, Seoul. My wife and I each finished work in different neighborhoods and met at Isu Station for dinner here. Hi, this is Edwood. After a whole week of getting slammed with work, there comes a moment when you crave a weekday dinner out just as badly as a weekend one. My wife and I recently had exactly that kind of day. I had commuted to Yongsan, and she had an important meeting near Gongdeok Station. After each of us survived a brutal day, neither of us had the energy left to cook dinner at home. Naturally, we agreed to grab a nice dinner together on the way back. Considering both our commutes and transfer lines, the most ideal meeting point turned out to be Isu Station. As it happened, we'd heard about a new tonkatsu and udon place near Isu Station that we hadn't tried yet. My wife loves Japanese food enough to wake up from a nap for it, so I headed straight there without a second thought. The place we visited was Kosi Isu Branch. ![Exterior of Kosi Isu Branch near Isu Station](https://img.superchart.com/images/koshi-isu-commute-dinner-bukkake-udon/koshi-isu-commute-dinner-bukkake-udon-01-163a8-900.webp) Carrying a week's worth of accumulated fatigue, I headed to the restaurant with real anticipation. It's located perfectly within walking distance of Isu Station, so getting there by public transit was really convenient. Being close to the subway exit makes it an easy meeting spot, and I couldn't think of better accessibility for a quick stop-in after work. ## Inside Kosi Isu Branch: atmosphere and seating The interior of Kosi Isu Branch was clean and modern without any clutter, and the generous spacing between tables made it comfortable for solo dining as well as dining with a companion. Being rush hour, the restaurant was lively with office workers. ![Clean and modern interior of Kosi Isu Branch](https://img.superchart.com/images/koshi-isu-commute-dinner-bukkake-udon/koshi-isu-commute-dinner-bukkake-udon-02-1l0ji-900.webp) The first impression the moment I stepped through the door was a very positive one. Overall, the interior had a clean, no-frills, modern feel. The distance between tables and the seating layout were efficient and spacious enough that you could focus entirely on your meal without being disturbed by conversations at nearby tables. ![Spaciously arranged table seating at Kosi Isu Branch](https://img.superchart.com/images/koshi-isu-commute-dinner-bukkake-udon/koshi-isu-commute-dinner-bukkake-udon-03-1u3n0-900.webp) It seemed like a great spot for a quiet solo meal, and also perfect for couples like us enjoying a post-work date. Looking around, the place was already buzzing with office workers enjoying their after-work dinner, clearly living up to its reputation as a well-known spot near Isu Station. ![Restaurant bustling with customers during after-work hours](https://img.superchart.com/images/koshi-isu-commute-dinner-bukkake-udon/koshi-isu-commute-dinner-bukkake-udon-04-xo4fi-900.webp) ### Ordering at the kiosk and what comes in the set At Kosi Isu Branch, you order at a kiosk near the entrance. Choosing tonkatsu comes with inari sushi (fried tofu pocket rice) included by default, and you can add a mini udon as an option for a more filling combo. Taking a slow look at the menu, there was a nice range of handmade noodles made fresh daily and katsu dishes made with carefully selected pork. Planning to share, we picked the crispy tonkatsu and the cold udon my wife loves. What I especially liked while ordering was the detail in the set composition — choosing tonkatsu automatically comes with savory inari sushi, and you can also add a mini udon with hot broth on the side, making for a really filling combo. Since my wife said it would take her a bit of time to get from Gongdeok to Isu Station, I ordered two cold draft beers first and waited for her with a pleasant sense of anticipation. ![Cold draft beer ordered while waiting for wife](https://img.superchart.com/images/koshi-isu-commute-dinner-bukkake-udon/koshi-isu-commute-dinner-bukkake-udon-05-ixeco-900.webp) ![Two glasses of draft beer on the table](https://img.superchart.com/images/koshi-isu-commute-dinner-bukkake-udon/koshi-isu-commute-dinner-bukkake-udon-06-b1hat-900.webp) ## Tonkatsu and bukkake udon, split half and half We split the tonkatsu and bukkake udon (cold udon with sauce poured over) we ordered at Kosi Isu Branch half and half on our own plates. The tonkatsu was crispy on the outside with meat packed solid all the way through, and the bukkake udon's house-made noodles had impressively springy texture. My wife arrived shortly after, and right on cue our main dishes were neatly set on the table. Just looking at the presentation was mouthwatering. ![Table set with tonkatsu and bukkake udon](https://img.superchart.com/images/koshi-isu-commute-dinner-bukkake-udon/koshi-isu-commute-dinner-bukkake-udon-07-1fdwn-900.webp) My wife and I like ordering different dishes and splitting them evenly, so once again we used side plates to divide the tonkatsu and udon fairly and started tasting. ![Tonkatsu and udon split in half on side plates](https://img.superchart.com/images/koshi-isu-commute-dinner-bukkake-udon/koshi-isu-commute-dinner-bukkake-udon-08-fu8df-900.webp) Chopsticks went first to the golden, crispy-fried tonkatsu. The moment I bit into it, there was a satisfying crunch and the juices spread through my mouth. ![Golden, crispy-fried tonkatsu](https://img.superchart.com/images/koshi-isu-commute-dinner-bukkake-udon/koshi-isu-commute-dinner-bukkake-udon-09-1kxau-900.webp) Looking at the cross-section, the meat was packed solid with no gaps, and the texture when chewing was excellent. It wasn't dry at all — the tender texture made it obvious right away that they use good quality meat. ![Cross-section of tonkatsu packed with meat](https://img.superchart.com/images/koshi-isu-commute-dinner-bukkake-udon/koshi-isu-commute-dinner-bukkake-udon-10-1bc8r-900.webp) Next we tried the bukkake udon my wife had been looking forward to. It's a cold udon style where you pour sauce lightly over the noodles and mix, and this restaurant's real strength was in the noodles themselves. ![Bukkake udon with sauce lightly poured over](https://img.superchart.com/images/koshi-isu-commute-dinner-bukkake-udon/koshi-isu-commute-dinner-bukkake-udon-11-149zb-900.webp) Being handmade noodles pulled fresh in-house, the springiness was on a completely different level from mass-produced noodles. The chewy, elastic bite that wrapped around your mouth with every chew was impressive enough to make you gasp. ![Handmade udon noodles lifted with chopsticks](https://img.superchart.com/images/koshi-isu-commute-dinner-bukkake-udon/koshi-isu-commute-dinner-bukkake-udon-12-yo3xd-900.webp) The umami of the sauce and the noodles came together perfectly, and I could completely understand why so many people rank this as a top pick near Isu Station. The overall set composition was excellent, and given current prices, the value felt reasonable too — a place that nails both value for money and satisfaction. After a bite of the tonkatsu, crispy outside and tender inside as it should be, alternating with warm udon broth and the chewy, cool cold udon kept things from ever getting boring, and by the end we were stuffed. ![Full spread of tonkatsu, mini udon and inari sushi](https://img.superchart.com/images/koshi-isu-commute-dinner-bukkake-udon/koshi-isu-commute-dinner-bukkake-udon-13-cplid-900.webp) ![Table at Kosi Isu Branch after finishing the meal](https://img.superchart.com/images/koshi-isu-commute-dinner-bukkake-udon/koshi-isu-commute-dinner-bukkake-udon-14-1iw62-900.webp) ## Draft beer with dinner at Kosi Isu Branch near Isu Station Kosi Isu Branch is definitely worth recommending to friends looking for a light, clean meal paired with a cold draft beer after work. If you want to fall for katsu packed with rich meaty flavor and chewy handmade udon that feels like it's made by an artisan, don't hesitate to visit. ![Signature image of tonkatsu and udon at Kosi Isu Branch](https://img.superchart.com/images/koshi-isu-commute-dinner-bukkake-udon/koshi-isu-commute-dinner-bukkake-udon-15-u1woj-1200.webp) ### Kosi Isu Branch: hours, location and visit info - Address: 1F, 126 & 127, 300 Sadang-ro, Dongjak-gu, Seoul, South Korea - Hours: 11:00–21:00 (break time 15:00–17:00) - Card payment accepted - Signature dishes: Tonkatsu / cold udon / tempura and more - Visit date: September 2026 ## 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 --- Superchart · https://superchart.com/en/@a-meal-break/koshi-isu-commute-dinner-bukkake-udon/ · https://superchart.com/llms.txt