# Seongsu pastry café window seat and Guanaja 40th dessert: Notldun

- By Hajin (https://superchart.com/en/@daejeon-supper-slate/)
- Written Sep 15, 2026
- Local places › Cafés › Seongdong, Seoul
- Sponsored: This is a review of a visit provided free of charge by the business.
- English edition: https://superchart.com/en/@daejeon-supper-slate/seongsu-notre-dieu-window-seat-teatime/
- Also in: [한국어](https://superchart.com/ko/@daejeon-supper-slate/seongsu-notre-dieu-window-seat-teatime/index.md)

## In short

Notldun is a pastry boutique café on Seoul Forest 2-gil in Seongsu, Seoul, run by two chefs whose petit gâteaux and baked-sweet selection are the main draw. From a window seat, Notldun's signature Noir was paired with an Americano and a vanilla latte, while the showcase held the Pistachio Festival, Salty Caramel Mille-feuille, a dessert marking Valrhona Guanaja's 40th anniversary, and 5 Valrhona madeleine flavors. With gift-box packaging available too, Notldun is one of the best cafés in Seongsu for a special dessert.

## Good to know

- **Address**: 11 Seoul Forest 2-gil, Seongdong-gu, Seoul, 1st floor (looks semi-basement from outside; use the stairs)
- **Hours**: Mon–Thu 11:00–22:00 (last order 21:30), Fri–Sun 11:00–22:30 (last order 22:00)
- **Getting there**: 11-min walk (748m) from Seoul Forest Station Exit 4; 12-min walk (752m) from Ttukseom Station Exit 8
- **Parking**: No dedicated lot; use the nearby Ttukseom Reservoir public parking lot
- **Coffee menu**: Espresso, espresso tonic, Americano, café latte, vanilla latte, cappuccino, Valrhona Guanaja mocha
- **Non-coffee menu**: Lemonade, grapefruit ade, vanilla Earl Grey milk tea, lattes (Jeju matcha, strawberry, dark chocolate), teas and tea ades
- **Desserts**: Pistachio Festival, Salty Caramel Mille-feuille, Signature Blanc and Noir, Guanaja 40th anniversary dessert, 5 Valrhona madeleine flavors (vanilla, raspberry, pistachio, Earl Grey, lime)

*as written by the visitor on Sep 15, 2026*

Today I want to recommend a Seongsu café for dessert lovers: Notldun. It's a pastry boutique run by two well-known chefs, serving desserts on a different level, plus a baked snack selection and clean box packaging that make it a popular choice for a thoughtful gift!

## Where is Notldun and when is it open?

![Exterior of Notldun café on Seoul Forest 2-gil](https://img.superchart.com/images/seongsu-notre-dieu-window-seat-teatime/seongsu-notre-dieu-window-seat-teatime-01-1j2o4-900.webp)

![Notldun's entrance leading down a staircase](https://img.superchart.com/images/seongsu-notre-dieu-window-seat-teatime/seongsu-notre-dieu-window-seat-teatime-02-ldxa8-900.webp)

Notldun is located at 11 Seoul Forest 2-gil, Seongdong-gu, Seoul, South Korea, 1st floor. It's open Monday to Thursday from 11:00 to 22:00 (last order 21:30), and Friday to Sunday from 11:00 to 22:30 (last order 22:00).

It's an 11-minute, 748m walk from Exit 4 of Seoul Forest Station, and a 12-minute, 752m walk from Exit 8 of Ttukseom Station. There's no dedicated parking lot, but the Ttukseom Reservoir public parking lot is nearby. The address says 1st floor, but from the outside the lower level looks semi-basement, so just head down the stairs to get in!

## Inside Notldun: seating and atmosphere

![Interior of Notldun with white-toned decor](https://img.superchart.com/images/seongsu-notre-dieu-window-seat-teatime/seongsu-notre-dieu-window-seat-teatime-03-1kodh-900.webp)

![Interior with a full glass wall and open baking area](https://img.superchart.com/images/seongsu-notre-dieu-window-seat-teatime/seongsu-notre-dieu-window-seat-teatime-04-1s0x8-900.webp)

The interior was clean and white-toned, and with a full glass wall, even though the space isn't huge, it never felt cramped and had a real sense of openness. The baking area was also open to view~

## Notldun's menu and showcase desserts

![Notldun's drink menu board](https://img.superchart.com/images/seongsu-notre-dieu-window-seat-teatime/seongsu-notre-dieu-window-seat-teatime-05-1p1y7-900.webp)

For coffee there was espresso, espresso tonic, Americano, café latte, vanilla latte, cappuccino, and a Valrhona Guanaja mocha. For non-coffee there was lemonade, grapefruit ade, vanilla Earl Grey milk tea, lattes (Jeju matcha, strawberry, dark chocolate), plus various teas and tea ades.

![Showcase displaying petit gâteaux at Notldun](https://img.superchart.com/images/seongsu-notre-dieu-window-seat-teatime/seongsu-notre-dieu-window-seat-teatime-06-1xirl-900.webp)

![Full view of the showcase filled with finely made desserts](https://img.superchart.com/images/seongsu-notre-dieu-window-seat-teatime/seongsu-notre-dieu-window-seat-teatime-07-1u3py-1200.webp)

And the showcase was lined with delicate, beautifully finished desserts — don't they look impressive just to look at?

![Pistachio Festival gâteau](https://img.superchart.com/images/seongsu-notre-dieu-window-seat-teatime/seongsu-notre-dieu-window-seat-teatime-08-bxkd5-900.webp)

![Cylinder-shaped Salty Caramel Mille-feuille](https://img.superchart.com/images/seongsu-notre-dieu-window-seat-teatime/seongsu-notre-dieu-window-seat-teatime-09-jip4r-900.webp)

The Pistachio Festival apparently has every layer — glaze, mousse, praline, cream, sponge — made with pistachio! The Salty Caramel Mille-feuille is shaped into a cylinder for extra crunch, which made it feel even more special.

![Gift-box-shaped signature dessert](https://img.superchart.com/images/seongsu-notre-dieu-window-seat-teatime/seongsu-notre-dieu-window-seat-teatime-10-1ch1q-900.webp)

![Signature Blanc and Noir on display](https://img.superchart.com/images/seongsu-notre-dieu-window-seat-teatime/seongsu-notre-dieu-window-seat-teatime-11-16w1m-900.webp)

### Gift-box-shaped Signature Blanc and Noir

And here's their gift-box-shaped signature! The Blanc combines white chocolate, raspberry, and pistachio, while the Noir combines milk chocolate, almond, and whiskey. I really like how they design multiple flavors and textures into one dessert so you get variety in a single bite.

![Guanaja 40th anniversary chocolate dessert](https://img.superchart.com/images/seongsu-notre-dieu-window-seat-teatime/seongsu-notre-dieu-window-seat-teatime-12-ohfou-900.webp)

### The Valrhona Guanaja 40th anniversary dessert

This one had been sold out but got restocked in the showcase later, so I got a separate photo of it — it's a dessert celebrating the 40th anniversary of Guanaja, the 70% cacao dark chocolate from the French premium chocolate brand. Layers made with Guanaja paired with coffee caramel are said to deliver a deep, intense cacao flavor.

![Display shelf of Valrhona madeleine selection](https://img.superchart.com/images/seongsu-notre-dieu-window-seat-teatime/seongsu-notre-dieu-window-seat-teatime-13-hs9ca-900.webp)

## Valrhona madeleines at Notldun and gift packaging

There was also a Valrhona madeleine selection that looked great for gifting.

![Vanilla and raspberry madeleines](https://img.superchart.com/images/seongsu-notre-dieu-window-seat-teatime/seongsu-notre-dieu-window-seat-teatime-14-agul8-900.webp)

There were 5 madeleine flavors, and you could tell the quality just from looking at them~ The flavors were vanilla, raspberry,

![Pistachio, Earl Grey, and lime madeleines](https://img.superchart.com/images/seongsu-notre-dieu-window-seat-teatime/seongsu-notre-dieu-window-seat-teatime-15-3mrp6-900.webp)

pistachio, Earl Grey, and lime,

![Notldun's baked snack gift packaging boxes](https://img.superchart.com/images/seongsu-notre-dieu-window-seat-teatime/seongsu-notre-dieu-window-seat-teatime-16-k6eph-900.webp)

and the petit gâteau and baked snack packaging boxes were so well done that lots of people were buying them as gifts.

## Window-seat tea time: Noir with Americano and vanilla latte

![Drinks and dessert set on a window-seat table](https://img.superchart.com/images/seongsu-notre-dieu-window-seat-teatime/seongsu-notre-dieu-window-seat-teatime-17-7z20p-900.webp)

![Window-seat tea time overlooking the alley outside](https://img.superchart.com/images/seongsu-notre-dieu-window-seat-teatime/seongsu-notre-dieu-window-seat-teatime-18-23hws-900.webp)

After ordering, I sat at a window seat for tea time, and with the alley and passersby visible below, I thought it was the perfect Seongsu café for soaking up the street atmosphere.

![Two cups: Americano and vanilla latte](https://img.superchart.com/images/seongsu-notre-dieu-window-seat-teatime/seongsu-notre-dieu-window-seat-teatime-19-ng625-900.webp)

The Americano was light with a bit of acidity rather than heavy, and the vanilla latte wasn't too sweet, making it a good match for cake.

I cut into the Noir wondering what would be inside, and overall it felt incredibly soft,

![Cross-section of the sliced Signature Noir](https://img.superchart.com/images/seongsu-notre-dieu-window-seat-teatime/seongsu-notre-dieu-window-seat-teatime-20-1oqza-900.webp)

![Noir showing mousse and almond layers](https://img.superchart.com/images/seongsu-notre-dieu-window-seat-teatime/seongsu-notre-dieu-window-seat-teatime-21-19yuq-900.webp)

with the soft mousse, nutty almond, and a subtle whiskey aroma coming together in a really luxurious way! I let out a little gasp the moment I took a bite. If a friend gave me this dessert as a gift, I'd be so happy👍

## Is Notldun worth visiting in Seongsu?

- A dessert spot with exceptional quality
- Great options for gifting
- A Seongsu café in Seoul with good access near the station

That wraps up my recommendation of Notldun as a Seongsu café — if you're looking for a dessert spot that's a bit out of the ordinary, it's worth a visit.

## Where it is

- Notldun (노틀던)
- 11 Seoul Forest 2-gil, Seongdong-gu, Seoul, South Korea
- 서울특별시 성동구 서울숲2길 11 1층
- 37.5473614, 127.0400154
- Google Maps: https://www.google.com/maps/search/%EB%85%B8%ED%8B%80%EB%8D%98/@37.5473614,127.0400154,17z

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