Sunday matinee jazz show and 7-course dinner in Seocho: Flat Nine

My mom had almost never been to a place where she could watch a live performance and eat a proper meal at the same time. I'd been wanting to take her to somewhere like that for a while, so this time I brought her to Flat Nine, a jazz bar in Gangnam. I'd visited once before with a friend and remembered the atmosphere being really good.

Honestly I was curious whether my mom would even like jazz. Spoiler: she loved it. She said the music wasn't too loud, it was calm and it put her at ease, and she said the food was better than she expected and ate well. It was my first time coming to a place like this with her too, so the whole day stuck with me.

Flat Nine's location and hours

FLATNINE 5F, 10 Gangnam-daero 65-gil, Seocho-gu, Seoul About 342m, roughly 5 min walk from Gangnam Station Exit 10 Mon-Thu 18:00-23:00 / Fri 18:00-24:00 / Sat 15:00-24:00 / Sun 15:00-23:00 Reservations available / groups welcome / no-kids zone

Exterior / location

When you arrive outside the building, there's a big sign reading FLATNINE Jazz Bar. Flat Nine is on the 5th floor of K-Tower.

Showtimes by day, and this day's lineup

Flat Nine's showtimes change by day of the week. Mon-Thu Set 1 from 20:00 Friday Set 1 from 19:00 / Set 2 from 21:40 Saturday Set 1 from 16:00 / Set 2 from 19:00 / Set 3 from 21:40 Sunday Set 1 from 16:00 / Set 2 from 19:00 We visited on a Sunday and caught the 4pm first set. That day's act was D-side Trio.

At the entrance there was a sign with the name of that day's act and showtime, and inside there was a full schedule of upcoming shows. Since the vibe of a jazz bar can shift quite a bit depending on who's playing, it's worth checking the lineup before you go.

Good to know before the show

Flat Nine adds a ₩15,000 per person live charge for watching a show, and the amount can vary depending on the performance.

Shows are split into two sets, with about a 20-30 minute intermission between them. During the performance, guests should avoid making noise loud enough to disturb others. Show schedules and detailed lineups are posted on Flat Nine's Instagram, and lineups may change.

Outside food isn't allowed in, and while you can bring in a cake, you can't eat it inside. Wine corkage is ₩50,000 per bottle per 2 people, and you can add one more corkage bottle for every bottle of wine you buy in-house. Staff mentioned that even whiskeys not on the menu can sometimes be ordered if you ask.

If you're going for the show, it helps to know the live charge is added on top of the food bill.

What the inside feels like

The interior was much bigger than I expected. Walking in, I was a little surprised at how spacious it felt. I'd pictured a jazz bar as a small, dim room with a handful of tables, but Flat Nine had plenty of seating and an overall sense of roominess.

What caught my eye first was the stage. A grand piano, drums, and various instruments and equipment were all properly set up, and it immediately felt like a place made for enjoying live music.

Today's star, my mom. Spotlight and everything, haha.

The wall behind the stage was covered with photos of various musicians, which made the space feel pretty cool on its own. Overall it had a black color scheme with soft lighting, which gave it a great atmosphere. Each table also had its own small light, so it wasn't too dark — exactly the right mood for watching a show.

There was also a Naver review event running

On the table tablet, I noticed a Naver Place review event. If you wrote a review with photos and text, you'd get a half bottle of sparkling wine. It wasn't complicated to join — on the tablet, go to order history → Naver Place review, scan the QR code, write your review, and get the wine confirmed on your way out. Just FYI.

Today's menu: Dinner Classic 7-course + fries

You order via the tablet at your table. Each table has an ordering tablet, with a fairly wide menu covering course meals, food, cocktails, beer, wine, and whiskey.

Flat Nine also runs course meals — Lunch 5-course ₩29,000 per person, Dinner Classic 7-course ₩39,000 per person, and Dinner Signature 8-course ₩59,000 per person. Courses could also be ordered for 2 or 3 people, and my mom and I went with the Classic course. Being able to watch a show while eating a proper course meal feels like one of Flat Nine's biggest strengths.

Dinner Classic 7-course, ₩39,000 per person

The main of the Classic course is Jeju black pork tenderloin steak. The order goes bread, salad, appetizer, pasta, palate cleanser, steak, and dessert — a nice pace for a slow meal while waiting for the show.

We each had a non-alcoholic aperitif since my mom doesn't drink.

After the aperitif came an amuse-bouche of thinly sliced potatoes stacked in layers and fried crisp.

Crispy on the outside, but the inside still had that soft potato texture — good from the very first bite. Bite-sized, so easy to eat without feeling heavy, and a great way to wake up your appetite before the course really started.

The bread was freshly baked focaccia. It came out warm, lightly crisp outside and soft inside, and dipping it in the extra virgin olive oil and balsamic glaze on the side was seriously delicious.

Salad / squid and melon carpaccio

The salad was a squid and melon carpaccio, topped with smoked squid, sweet melon, and thin pickled radish. I loved this one last time too — the squid was chewy with a faint smoky note, and the melon's sweet, cool flavor paired better than I expected. The bright tang of the pickled radish rounded it out, and my mom liked it too.

Mille-feuille lasagna

The mille-feuille lasagna looked great before we even tasted it. Thin sheets of pasta layered on top of each other with tomato sauce underneath, giving it a much more refined, neatened-up look than the lasagna you'd usually picture.

One bite and the soft pasta played well with the tangy tomato sauce, and the layered structure made the texture fun too.

Fries

I was going to order pasta but my mom is a fries fanatic so we got these instead — she said they tasted like domestic Korean potatoes and gave them a full review while enjoying every bite. Certified fries-approved by my mom, the resident fries lover. Just FYI, haha.

D-side Trio live jazz performance

By the time we finished eating, the show was ready to start. The 4pm set that day was D-side Trio — piano by Daum, bass by Jeon Je-gon, drums by Park Sang-hyun.

The piano was great, but what really stood out was the deep resonance of the double bass.

Watching a jazz show while eating — such a good vibe. What I liked most was that it wasn't loud. You could eat, talk, and still stay tuned into the music at the same time, which made it easy to enjoy even if you don't know much about jazz.

My mom was completely into it. She said the jazz melodies made her feel at ease, and she clapped right on time (proud of myself for bringing her, haha).

We weren't really in the mood for alcohol that day, so we ordered a nice juice instead.

Main: Jeju black pork tenderloin steak, and dessert

The main dish, Jeju black pork tenderloin steak, caught the eye first with its green herb crust on top.

Being tenderloin, the texture was quite soft, and the subtle herb aroma paired better than expected with the mild black pork. The herb crust on the outside added extra texture and fragrance, making it feel much more substantial than just plain steak. It was noticeably more filling than everything before it, a satisfying way to close out the course.

For dessert, you request it via the tablet and they bring out a chocolate brownie cake.

Dense and rich — exactly the kind of dessert I love. A perfect finish.

After the show, my mom and I went shopping in Gangnam and made another happy memory.

One-line review

Flat Nine is a great spot for a Sinnonhyeon-area date, with delicious course food and easygoing live jazz. Just as good for a special time with your parents as it is for a date.