Hongdae Japanese restaurant for family katsu and udon: Katsu Monster

In short

Katsu Monster Yeonnam Main Branch is a Japanese restaurant near Hongdae in Mapo, Seoul. My family ordered the 35,000-won set for two and enjoyed loin and tenderloin katsu, salad, and a generous bowl of udon that my child kept asking for. Verdict: a comfortable, good-value choice for a family meal.

Set for two with salad and katsu

Good to know

Hours
Daily 10:30 AM–9 PM
Break time
3:30 PM–4:30 PM
Loin katsu
₩14,000
Tenderloin katsu
₩16,000
Cheese katsu
₩17,000
All Katsu
₩18,000
Triple Katsu
₩21,000
Set for one
₩22,000
Set for two
₩35,000
Spicy chicken curry udon
₩12,000
Kimchi katsu nabe
₩16,000
Cold soba, cold udon, or bonito fish cake udon
₩10,000 each
Chicken karaage (3 pieces)
₩8,000
Fried gyoza dumplings (6 pieces)
₩5,000

as written by the visitor on Sep 9, 2026

If I had to name one of the hot places lately, Hongdae would definitely be it. There are so many people walking around, and so many international visitors too. Since it’s summer these days, it feels like such a lively neighborhood, with lots of people showing off all kinds of fashion. With so many people, there are also so many restaurants, so it can feel a bit overwhelming. But among them are places that lots of people seek out, and I could see there’s a reason for that. I went sightseeing around Hongdae with my family recently and visited Katsu Monster Yeonnam Main Branch.

Katsu Monster Yeonnam Main Branch hours and exterior

It is open daily from 10:30 AM to 9 PM, with a break from 3:30 PM to 4:30 PM.

Exterior of Katsu Monster Yeonnam Main Branch
Exterior

Walk about five minutes from Exit 3 of Hongdae Station and you’ll find the restaurant. It also has KATSU MONSTER written on it. The standing banner includes photos of the main dishes.

Standing banner with menu photos

There are lights on the sign, banner, and roof eaves, so it is easy to spot even after dark.

Menu board at the restaurant entrance
Menu board

You can look over the menu and photos before going in, so you can decide what you want in advance.

Rider pickup zone in front of the restaurant

There was a rider pickup zone out front. Some people come in to eat, but it seems that many people order delivery too. Riders kept coming to pick up orders while we were eating.

Kiosk ordering and seating

Interior of Katsu Monster Yeonnam Main Branch
Interior

When you enter, you can see seats lined up along one side and tables in the middle.

Counter seats and table seating

There is a kiosk at every seat, so you can order there.

Kiosk ordering area at each seat

There are tables for two as well, so this would be a good spot to sit when you come on a date. There is a basket underneath for your belongings.

Table for two with a basket

Each seat has salad dressing, tonkatsu sauce, salt, mustard, and more, along with utensils, a water pitcher, and cups.

Seat set with sauces and utensils

I sat at one of the lined-up seats, and it was convenient because everything I needed was close by. I poured water into my cup and put tonkatsu sauce into the small dish. Personally, I added a little mustard too, and it suited my taste really well!

Tonkatsu sauce and mustard set out
Seasoning selection on the table

There was also something like slightly spicy chili powder, so have a look!

Spicy chili-powder seasoning

The wall clearly lists the food names, photos, and descriptions.

Wall listing food names and descriptions

Since this neighborhood gets so many international visitors, the descriptions are in Korean, English, and Chinese. Compared with when I used to get around a lot, I have recently felt that there are truly so many more Western visitors.

The set for two my family had

Loin katsu is ₩14,000, tenderloin katsu is ₩16,000, cheese katsu is ₩17,000, All Katsu is ₩18,000, Triple Katsu is ₩21,000, the set for one is ₩22,000, and the set for two is ₩35,000. Spicy chicken curry udon is ₩12,000, kimchi katsu nabe is ₩16,000, and cold soba, cold udon, and bonito fish cake udon are ₩10,000 each. Chicken karaage (3 pieces) is ₩8,000, while fried gyoza dumplings (6 pieces) are ₩5,000. I ordered the set for two.

Set for two that was ordered
Set for two with loin and tenderloin katsu

It includes loin and tenderloin katsu. This much food comes with salad too!

Set for two with salad and katsu

Udon comes with it too, and the broth was delicious, so my child kept asking for more.

Udon in a huge bowl

It came in a huge bowl, so the portion was very generous.

Generous bowl of udon

The kimchi served as a side dish was a really great match too. You can finish with the snack after your meal.

Kimchi and after-meal snack sides

The spicy soup served beside the rice was addictive too.

Spicy soup served beside rice

You can ladle out the udon to eat it.

Udon served with a ladle
Udon included in the set for two

Both the tenderloin and loin were nicely substantial inside.

Tenderloin and loin katsu filled to the center

In the end, after devouring everything, we finished it all. Katsu Monster Yeonnam Main Branch is great for dining in, and if you live nearby, it is also a good restaurant to order from without any fuss. The prices are kind for the quality, and the set menus in particular are well put together, so I could see why the overall reviews are good. It is not easy to choose just one among the many restaurants in Hongdae, but if you are unsure, I think this is a place you can choose comfortably!

Where it is

Katsu Monster Yeonnam Main Branch카츠몬스터 연남본점

Unit 101, 1F, 42-6 Donggyo-ro 38-gil, Mapo-gu, Seoul, South Korea서울특별시 마포구 동교로38길 42-6 1층 101호 카츠몬스터 연남본점

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