# Kid-friendly tonkatsu restaurant in Dongjak, Seoul: lunch at Kosi Isu - By Nara Bang (https://superchart.com/en/@seongsu-lunch-crate/) - Written Sep 20, 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/@seongsu-lunch-crate/koshi-isu-cheese-katsu-bukkake-udon-9dfa/ - Also in: [한국어](https://superchart.com/ko/@seongsu-lunch-crate/koshi-isu-cheese-katsu-bukkake-udon-9dfa/index.md) ## In short Kosi Isu Branch is a tonkatsu and udon restaurant on Sadang-ro near Isu Station in Dongjak, Seoul. Over a lunchtime visit with the kids, cheese tonkatsu and bukkake udon (cold sauce-topped noodles) were ordered together; the lunch peak meant a 20–30 minute wait, but sofa seating made the meal comfortable, and the stretchy cheese and chilled udon pleased both children and adults. Kosi Isu Branch is an easy Isu Station pick for eating out with kids, with no menu debates needed. ## Good to know - **Location**: 300 Sadang-ro, Dongjak-gu, Seoul - **Hours**: Daily 11:20–21:00 (break 15:20–17:00) - **Parking**: 1 hour free in the building's underground lot - **Wait**: 20–30 minutes if you arrive at lunchtime - **Ordered**: Cheese tonkatsu, bukkake udon *as written by the visitor on Sep 20, 2026* ![Main photo of cheese tonkatsu and bukkake udon at Kosi Isu Branch](https://img.superchart.com/images/koshi-isu-cheese-katsu-bukkake-udon/koshi-isu-cheese-katsu-bukkake-udon-01-1jn0q-1200.webp) > Springy, cool bukkake udon > A delicious lunch enjoyed with the kids Even though fall had started, the sun was hot today and the more I walked, the more I craved something cold~ I took my kid and their friend out for lunch and went looking for an Isu Station restaurant where we could get both the cheese tonkatsu the kids love and cool bukkake udon. Turns out a lot of people had the same idea. When I got to the front of the restaurant, there it was… a wait 😭 ![Front of Kosi Isu Branch during the lunchtime wait](https://img.superchart.com/images/koshi-isu-cheese-katsu-bukkake-udon/koshi-isu-cheese-katsu-bukkake-udon-02-lv32i-m-966.webp) So many families wanting to enjoy Isu Station tonkatsu and Isu Station udon together that we waited about 20–30 minutes before getting seated. There was a bit of a wait, but seeing the kids get excited picking their menu made me think we'd picked the right lunch spot! Let me tell you about Kosi Isu Branch 😊 ## Where is Kosi Isu Branch, and what are the hours and parking? ![Entrance of Kosi Isu Branch on Sadang-ro in Dongjak-gu, Seoul](https://img.superchart.com/images/koshi-isu-cheese-katsu-bukkake-udon/koshi-isu-cheese-katsu-bukkake-udon-03-1xspe-966.webp) - 📍 Location: 300 Sadang-ro, Dongjak-gu, Seoul - ⏰ Hours: Daily 11:20 – 21:00 (break time 15:20–17:00) - 🅿️ Parking: 1 hour free parking in the building's underground lot During lunch hours when people flock to this Isu Station restaurant, waits can happen, so I'd recommend visiting with some extra time. We waited about 20–30 minutes, and if you're with kids, avoiding the exact peak dining hour is also a good idea 👍 Since you can choose both Isu Station tonkatsu and cool noodle dishes in one place, it also works well for families with different taste preferences. If you're wondering where to eat lunch with kids near Isu Station, the choices here are clear, which makes ordering easy. ## Is Kosi Isu Branch comfortable for eating with kids? ![Interior of Kosi Isu Branch busy with lunch guests](https://img.superchart.com/images/koshi-isu-cheese-katsu-bukkake-udon/koshi-isu-cheese-katsu-bukkake-udon-04-16ly4-m-966.webp) Inside Kosi Isu Branch was lively with lunch guests. With the wait outside, most tables were full, but there were sofa seats, which made for a comfortable atmosphere to eat with the kids. ![Sofa seating at Kosi Isu Branch, comfortable for sitting with kids](https://img.superchart.com/images/koshi-isu-cheese-katsu-bukkake-udon/koshi-isu-cheese-katsu-bukkake-udon-05-118yp-966.webp) True to being a popular Isu Station restaurant, I saw a lot of tables with both tonkatsu and udon ordered together. The kids were busy discussing what to order the moment we sat down, full of anticipation before the food even arrived 😆 When eating out with kids near Isu Station, it's reassuring to have a menu item you know they'll definitely eat, and having cheese tonkatsu on the menu made me feel at ease. ## Cheese tonkatsu at Kosi Isu Branch: a hit with the kids 🍽️ Here's what we ordered that day ‼️ - ✔️ Cheese tonkatsu - ✔️ Bukkake udon ![A plate of the ordered cheese tonkatsu](https://img.superchart.com/images/koshi-isu-cheese-katsu-bukkake-udon/koshi-isu-cheese-katsu-bukkake-udon-06-blcln-966.webp) The kids' choice was, of course, cheese tonkatsu! The golden-brown breading was crispy, and packed inside was plenty of savory, soft cheese that stretched long with every piece lifted 💖 The crispy coating, juicy meat, and rich, savory cheese all came together in one bite — a flavor kids just can't resist. ![Cross-section of the crispy-coated cheese tonkatsu](https://img.superchart.com/images/koshi-isu-cheese-katsu-bukkake-udon/koshi-isu-cheese-katsu-bukkake-udon-07-4edt9-966.webp) ![A piece of cheese tonkatsu stretching long](https://img.superchart.com/images/koshi-isu-cheese-katsu-bukkake-udon/koshi-isu-cheese-katsu-bukkake-udon-08-vwa5r-m-966.webp) The cheese tonkatsu at Kosi, a well-loved Isu Station restaurant, was crispy outside and soft inside, so it wasn't overwhelming for the kids to eat either. "Want me to show you the best way to eat the cheese?" — the kids each showing off their own eating method 🤣 ![Kids eating cheese tonkatsu together](https://img.superchart.com/images/koshi-isu-cheese-katsu-bukkake-udon/koshi-isu-cheese-katsu-bukkake-udon-09-8ix3j-966.webp) ![A bite of cheese tonkatsu dipped in sauce](https://img.superchart.com/images/koshi-isu-cheese-katsu-bukkake-udon/koshi-isu-cheese-katsu-bukkake-udon-10-xpg2i-966.webp) One kid stretched the cheese out long, the other dipped it lightly in sauce for a single bite — each enjoying it their own way. Watching them chat happily while eating made the wait time fade from memory quickly. If your kid loves cheese dishes, this is likely to be one of the more satisfying Isu Station tonkatsu options. ## Cold bukkake udon for a hot day ![A bowl of cold bukkake udon](https://img.superchart.com/images/koshi-isu-cheese-katsu-bukkake-udon/koshi-isu-cheese-katsu-bukkake-udon-11-1sb5x-966.webp) The bukkake udon (cold sauce-topped noodles) at Kosi Isu Branch fit the hot weather perfectly — served cold, the noodles' springiness and chewiness came through even more clearly. The bouncy noodles paired evenly with a savory, salty sauce for a refreshing bite, and alternating it with the tonkatsu cleanly cut through any richness ✨ ![Springy bukkake udon noodles mixed with sauce](https://img.superchart.com/images/koshi-isu-cheese-katsu-bukkake-udon/koshi-isu-cheese-katsu-bukkake-udon-12-17vx2-966.webp) Mixing the noodles well with the sauce gave an even seasoning throughout, and even slurped down quickly, that chewy texture stayed alive~ ![Lunch table set with bukkake udon](https://img.superchart.com/images/koshi-isu-cheese-katsu-bukkake-udon/koshi-isu-cheese-katsu-bukkake-udon-13-1u86e-966.webp) A great dish for anyone looking for cool, filling Isu Station udon. If you're torn on what to order at this Isu Station restaurant, I'd recommend ordering both cheese tonkatsu and bukkake udon to share. The kids happily went back and forth between the crispy, savory cheese tonkatsu and the springy, cool bukkake udon 😊 ## Looking for a kid-friendly restaurant near Isu Station? ![A spread at Kosi Isu Branch good for eating out with kids](https://img.superchart.com/images/koshi-isu-cheese-katsu-bukkake-udon/koshi-isu-cheese-katsu-bukkake-udon-14-3p7n6-966.webp) When looking for a place to eat out with kids near Isu Station, it matters whether it satisfies both the kids' menu and the adults' menu! ![Table set with both cheese tonkatsu and bukkake udon](https://img.superchart.com/images/koshi-isu-cheese-katsu-bukkake-udon/koshi-isu-cheese-katsu-bukkake-udon-15-gr7m2-m-966.webp) Kosi Isu Branch made for a good meal setup since you can order the savory cheese tonkatsu and cool bukkake udon together. ![Table setup for sharing tonkatsu and udon](https://img.superchart.com/images/koshi-isu-cheese-katsu-bukkake-udon/koshi-isu-cheese-katsu-bukkake-udon-16-18zll-966.webp) If you want to try both tonkatsu and udon at this Isu Station restaurant, order both and share! Just note there may be a wait during lunch hours~ If you want to enjoy Isu Station udon and tonkatsu together like we did, I'd recommend heading over a bit early. ## Final verdict on Kosi Isu Branch ![Two lunch dishes enjoyed at Kosi Isu Branch](https://img.superchart.com/images/koshi-isu-cheese-katsu-bukkake-udon/koshi-isu-cheese-katsu-bukkake-udon-17-gtrle-966.webp) The cool bukkake udon I craved on a hot fall day, and the kids' favorite cheese tonkatsu — Kosi Isu Branch let us enjoy both together for a satisfying lunch. ![Cheese tonkatsu and udon near the end of the meal](https://img.superchart.com/images/koshi-isu-cheese-katsu-bukkake-udon/koshi-isu-cheese-katsu-bukkake-udon-18-1o9uq-m-966.webp) The 20–30 minute wait was a bit of a downside, but it also made clear just how popular this Isu Station restaurant is. Watching the kids happily talk about their own ways of enjoying the cheese made me smile too 😊 I'll definitely think of this place again when I want to try both Isu Station tonkatsu and udon in one meal, or when I want to eat with kids without any menu debates. An Isu Station restaurant where both kids and adults could each enjoy their favorite dish! If you're planning a delicious lunch with kids, I'd recommend it~ ## Where it is - Kosi Isu Branch (코시 이수점) - 300 Sadang-ro, 1st Floor, Units 126 & 127, 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/@seongsu-lunch-crate/koshi-isu-cheese-katsu-bukkake-udon-9dfa/ · https://superchart.com/llms.txt