Seongsu café with Einspänner and choco crookie set: Iridescent

In short

Iridescent is a black-fronted café and dessert shop at Seoulsup 4-gil in Seongdong-gu, Seoul, near Ttukseom Station in Seongsu. The writer ordered Iridescent's Einspänner (coffee topped with cream) and chocolate crookie (croissant-cookie) set and enjoyed the large, crispy crookie and the nut-topped Einspänner at an outdoor seat overlooking the Seongsu streets. For coffee and dessert in one go with a taste of Seongsu's atmosphere, the Iridescent set menu is a good fit.

Einspänner and choco cruffin on the table

Good to know

Getting there
Ttukseom Station Exit 8 · 7-min walk (store listing, Oct 6, 2026)
Location
1F, 20-1 Seoulsup 4-gil, Seongdong-gu, Seoul
Ordered
Einspänner + chocolate crookie set
Other set combinations
Perilla leaf smoothie + dumpling latte + pepper tiramisu; Einspänner + Iridescent latte + s'more brookie, and more
Other menu items
Iridescent latte, perilla leaf smoothie, yuzu basil granita, pepper tiramisu
Seating
Several indoor areas, plus outdoor perch seats facing the Seongsu streets

as written by the visitor on Oct 22, 2026

What is Iridescent, the Seongsu café, like?

Iridescent is a café and dessert shop on Seoulsup 4-gil in Seongsu. I'm back with a Seongsu café story after a while! Honestly, I'm looking for a new place to move to, and Seongsu is where I want to end up, so I keep going there! That's how I found Iridescent, a Seongsu café with a great vibe, and I wanted to introduce it to you :) No matter how often I visit Seongsu, I always want to go back.

This is what the outside of Iridescent looks like! The shop is done in black, which gives it a chic, modern feel.

Black-toned exterior of Iridescent café in Seongsu

What's on the Iridescent menu?

You can see the Iridescent menu as soon as you step inside.

Menu board visible from the entrance of Iridescent

I really wanted to try the perilla smoothie (T_T), but I went for coffee first and will save the perilla smoothie for next time.

Iridescent menu listing the perilla smoothie and other drinks

Here's a clearer photo of the Iridescent menu (source: Iridescent on Naver Map). From the Iridescent latte to the unusual items..!!

Iridescent's unusual menu items, from Naver Map

Next time I want to try the yuzu basil granita (a slushy-style frozen drink) and the pepper tiramisu, haha

Iridescent set menu options

I chose the Einspänner + chocolate cruffin (croissant-cookie hybrid) set. Being able to taste both the Einspänner and the choco cruffin at once made it feel like good value! There was also a set with a perilla smoothie + dumpling latte + pepper tiramisu, and another with an Einspänner + Iridescent latte + s'more brookie and more.

Coffee and dessert set combinations at Iridescent

Iridescent's indoor seating and atmosphere

Let me show you the inside of Iridescent too! Seongsu really is the hot spot... lately I eat almost only in Seongsu... there are so many great restaurants and so many places with a nice mood. So much to see... I can't give up Seongsu...

Interior of Iridescent café in Seongsu

Iridescent has a variety of spaces, so you can sit wherever suits you.

Seating areas at Iridescent to choose from by taste

What the name Iridescent means

This is Iridescent's business card. Iridescent means a color that shines differently depending on the angle you view it from. Maybe that's why the menu uses such varied ingredients and aims for new flavors!

Iridescent café business card

It feels like they take care with their coffee beans too! I think I'll become a regular! The logo is pretty as well.

Iridescent café logo

How did the Einspänner and choco cruffin set taste?

My Einspänner plus choco cruffin set has arrived!

Iridescent Einspänner and choco cruffin set

I'll show it to you several times, haha. I'm serious about food and menus... taking lots of photos has become a habit.. And you get a cruffin and a coffee, so it's killing two birds with one stone, right?

Einspänner and choco cruffin on the table
Einspänner and cruffin set from another angle

Chocolate cruffin

Iridescent's choco cruffin is crispy, and best of all, it's big.

Crispy, oversized chocolate cruffin at Iridescent

Einspänner

Now for the Einspänner :) The nutty toppings on top and the coffee underneath went together fantastically.

Iridescent Einspänner topped with nutty toppings

Watching the Seongsu street from Iridescent's outdoor seats

Above all, the biggest plus of Iridescent was being able to perch outside and eat while watching the Seongsu street!

Iridescent's outdoor seats facing the Seongsu street
Seongsu street seen from Iridescent's outdoor seats

Here are more corners of Iridescent.

Corners of the Iridescent shop
Indoor seating and interior at Iridescent
Overview of the Iridescent space

Iridescent was a place where I could enjoy a lovely Seongsu café, take in Seongsu itself, and try both a wide range of menu items and unusual ones.

Iridescent café in Seongsu
Scene capturing the atmosphere of Iridescent café

Where it is

Iridescent이리데센트

20-1 Seoulsup 4-gil, Seongdong-gu, Seoul, South Korea (1st floor)서울특별시 성동구 서울숲4길 20-1 1층

Open in Google Maps

Local places · Cafés