Yeonnam-dong tonkatsu revisit, three sauce refills: Katsu Monster

In short

Katsu Monster Yeonnam Main Branch is a Japanese-style tonkatsu (breaded pork cutlet) restaurant in an alley in Yeonnam-dong, Mapo, Seoul. A Hongdae resident of 3 years, who first came with her father, returned with a friend to share cheese, fillet and loin katsu sets, refilled the tonkatsu sauce 3 times and finished the last piece with salt. Thanks to thick cuts and generous portions, Katsu Monster Yeonnam Main Branch is a Yeonnam-dong tonkatsu spot worth returning to for lunch or a solo meal.

Signature photo of Japanese tonkatsu at Katsu Monster Yeonnam Main Branch

Good to know

Getting there
Hongik Univ. Station Exit 3 · 6-min walk (store listing, Oct 6, 2026)
Location
Unit 101, 1st floor, 42-6 Donggyo-ro 38-gil, Mapo-gu, Seoul (past Yeontral Park, in the Yeonnam-dong alleys)
Menu
Tonkatsu, rice bowls, soba, curry, udon
What we ordered
Cheese katsu + fillet set, fillet + loin set
Seating
Not many tables; solo seats up to 4-person tables
On the table
Salad dressing, wasabi
Sauce
Japanese-style tonkatsu sauce refills available (the writer refilled 3 times)

as written by the visitor on Sep 30, 2026

Signature photo of Japanese tonkatsu at Katsu Monster Yeonnam Main Branch

Why I went back to Katsu Monster Yeonnam Main Branch

Katsu Monster Yeonnam Main Branch is the Japanese tonkatsu place you have to visit if you're looking for a great cutlet spot in Yeonnam-dong. I've lived in Hongdae for three years now, and after going once with my dad, I went again this time with a friend — and once again confirmed it's a proven favorite. If you've got a lunch date in Yeonnam-dong, you have to bring them here!

I visited the Yeonnam Main Branch, and it turns out this is a proper Japanese tonkatsu chain with four locations across Seoul. There are just so many hotspot restaurants in Yeonnam-dong that I don't think I'll ever be able to leave Hongdae... T_T

Katsu Monster Yeonnam Main Branch in the Yeonnam-dong alley
The surroundings around Katsu Monster Yeonnam Main Branch
Walking path to Katsu Monster Yeonnam Main Branch near Yeontral Park

Where is Katsu Monster Yeonnam Main Branch?

You'll find Katsu Monster Yeonnam Main Branch if you walk past Yeontral Park and wander through the Yeonnam-dong alleys. It's like a hidden gem of a tonkatsu place in Hongdae's Yeonnam-dong — already famous among local residents and office workers who love tonkatsu as a go-to lunch or solo-dining spot in Yeonnam-dong, and it draws plenty of customers.

Interior atmosphere of Katsu Monster Yeonnam Main Branch
Inside view of Katsu Monster Yeonnam Main Branch
Interior photo of Katsu Monster Yeonnam Main Branch
Japanese-style interior of Katsu Monster Yeonnam Main Branch

What Japanese dishes does Katsu Monster serve besides tonkatsu?

Katsu Monster Yeonnam doesn't just serve tonkatsu — it also has rice bowls, soba, curry, and udon, basically every Japanese dish you'd want to try on a trip to Japan. So it's like meeting Japan right here in Yeonnam-dong — come whenever you're craving a Japan trip. Honestly, it's better than the tonkatsu I had in Japan, so once you try it, you'll understand why this Yeonnam-dong spot has people waiting in line. Haha

Photo related to Katsu Monster Yeonnam's Japanese menu
Katsu Monster Yeonnam's tonkatsu, rice bowl, and soba menu

Is Katsu Monster good for solo dining?

Katsu Monster Yeonnam Main Branch doesn't have a ton of tables, but it has everything from solo seats to 4-person tables, which is why it's loved by solo diners in Yeonnam-dong and Hongdae. I've been going around looking for good Hongdae solo-dining spots lately, and this place comes to mind every time. T_T

Seating and tables at Katsu Monster Yeonnam Main Branch

Sharing loin, fillet and cheese katsu sets with a friend

For this return visit, we went with the classics — loin, fillet, and cheese options — and split them nicely with my friend. Though it really did take forever to decide (indecisive as always...)

Table spread of loin, fillet, and cheese katsu shared with a friend
Katsu Monster's cheese katsu and fillet set
Katsu Monster Yeonnam Main Branch tonkatsu set menu
Thick, hearty Japanese tonkatsu from Katsu Monster
A table with two Katsu Monster tonkatsu sets laid out

Cheese katsu + fillet set: two big pieces of cheese katsu

Katsu Monster's set that pairs cheese katsu with fillet gives you two big chunks of cheese katsu, so your mouth fills with rich cheesy aroma. Haha. Just looking at it, you can tell this is a tonkatsu place with real skill behind it.

Two hefty pieces of Katsu Monster cheese katsu
Cheesy inside of Katsu Monster's cheese katsu

Fillet + loin set: filling even for one grown man

The set that combines fillet and loin comes out thick and generous — plenty even for one grown man to finish on his own. You can really feel how much meat they put into it, filling your mouth with the taste of authentic Japanese tonkatsu.

Katsu Monster's fillet and loin katsu set
Thick, generous loin katsu from Katsu Monster
A single piece of Katsu Monster fillet katsu

How to eat Katsu Monster tonkatsu: sauce refills and salt

Katsu Monster Yeonnam Main Branch has salad sauce and wasabi on every table, so you can add them to your taste. I love the Japanese-style tonkatsu sauce, so I ended up refilling it three times. Haha

Katsu Monster tonkatsu with Japanese-style tonkatsu sauce
Eating Katsu Monster tonkatsu with sauce

Still, I wanted to finish the very last piece cleanly with just salt, so — a little reluctantly — I savored the final fillet and loin katsu topped with salt, nice and slow!

The last piece of fillet and loin katsu topped with salt

A Hongdae local's pick for tonkatsu in Yeonnam-dong

I don't need to say it's a great restaurant over and over — the photos prove it. So many places used to be here and are gone now, places that existed and then vanished... haha. If you're planning a weekend outing to Yeonnam-dong, don't go searching far and wide — just head to Katsu Monster Yeonnam Main Branch, the go-to lunch spot in Hongdae and Yeonnam.

Where it is

Katsu Monster Yeonnam Main Branch카츠몬스터 연남본점

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

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