Mullae-dong's steel alleys, where music video crews borrow a working backdrop

On a Saturday afternoon in Mullae-dong (문래동), a grinder throws a short fan of sparks across an alley barely wider than a delivery truck. Ten metres on, a stylist is steaming a jacket on a clothes rail propped against a rolled steel shutter, and a camera assistant is taping a mark on the concrete where a singer will stand. Neither looks at the other. The steel shop has an order to finish, the crew has a few hours of light, and this corner of western Seoul has learned to hold both at once.

A district named for a spinning wheel

Mullae sits in Yeongdeungpo (영등포), south of the Han River, in a grid of low blocks numbered from 1-ga to 6-ga. The local story ties the name to the mullae (물레), a spinning wheel, because large textile mills once covered this flat land near the railway. Whether or not that story is true, the mills brought the factories, and the factories brought everything else. Most of what visitors photograph now came later, when metalworking shops pushed out of central Seoul around Cheonggyecheon (청계천) and Euljiro (을지로) moved into two- and three-storey buildings here.

What remains is a working cluster of cheolgongso (철공소), small steel shops that cut, bend, weld and machine metal to order. Most are barely deeper than a garage. Sheets of steel lean against the outside walls, rods sit stacked on wooden pallets in the street, and a hand-lettered sign over the door gives the trade and a mobile number instead of a brand. The shops take orders from builders and manufacturers, so the alleys are busiest while the rest of the city is at its desks.

Why the cameras keep coming back

Seoul has plenty of glass towers and restored hanok, and on screen the high-rises of Yeongdeungpo or the tiled roofs of Bukchon (북촌) say Seoul at a glance. Mullae offers something rarer: a backdrop that could be anywhere. Corrugated roofs, rust running down from window frames, tangled overhead cables and the ribs of roller shutters give an art director texture without a landmark. A music video or a drama's late-night chase can borrow these alleys and nobody watching will pin them on a map. Many shutters are painted with murals, stencils and the odd cartoon welder, left by artists who took the upper floors when rents here were low.

Light does much of the work. In the late afternoon, low sun catches the sheet metal and turns it orange. After dark the district runs on a patchwork of fluorescent tubes from workshops still running, amber streetlamps and the warmer bulbs of bars that now fill old workshops. You will sometimes see the signs of a shoot without the shoot itself: a white van with its sliding door open, a folding table of snacks, a reflector leaning against a pallet. Treat these as you would any workplace. The crew is working to a schedule, and the alley is not a waiting room.

Reading an alley that is still at work

The best way to see Mullae is to accept that none of it is staged for you. On weekdays a lathe, labelled seonban (선반) on the signboards, hums behind a half-raised shutter. A forklift backs out of a doorway with a bundle of pipe, and the air smells of cutting oil and hot metal, not coffee. Workers eat at small baekban (백반) restaurants tucked between the shops, a set meal of rice, soup and side dishes, eaten and left within the lunch hour. Walking here means stepping aside often and keeping well clear of anyone grinding or welding, because sparks and offcuts travel further than they look.

On Sundays much of this goes quiet. The shutters come down, which is when the painted ones show, and the alleys empty enough for long exposures. The trade-off is that the district loses what makes it unusual, and a shuttered Mullae can feel like any back street with good murals. If you want a picture of the work itself, ask first, keep it short, and take a shake of the head as a full answer.

사진 한 장 찍어도 될까요?

Sajin han jang jjigeodo doelkkayo: may I take one photo. Ask it with your phone lowered, not raised, and it comes across as a real question rather than a formality. Some workers will wave you on without looking up. Others would rather you photograph the sign and move along, and both answers deserve the same respect.

Upstairs, the other Mullae

Above and between the workshops is a second neighbourhood that keeps different hours. Artists began renting studios on the upper floors, and Seoul's city arts foundation runs Mullae Arts Factory (문래예술공장, Mullae Yesul Gongjang), a purpose-built arts centre that hosts residencies, rehearsals and occasional performances. Check its programme before you plan a day around it. Smaller galleries open on irregular schedules, often only while an exhibition is on.

The ground floors have changed fastest. Old workshops now hold coffee roasters, wine bars, small breweries and pasta places, many keeping the original steel beams, sliding doors and chain hoists overhead. Several have a roof terrace or an upstairs window over the corrugated roofs, and this is the view photo shoots borrow most: a low spread of grey and rust-red panels with the towers of Yeongdeungpo behind. The move from welding to brunch has not been seamless. Rents follow foot traffic, and the dark shutters between busy cafés are not always closed just for the weekend.

Getting there, and the mistake to avoid

Line 2, the green line, stops at Mullae Station (문래역), and the steel alleys are a short walk away. Yeongdeungpo-gu Office Station (영등포구청역), where Lines 2 and 5 meet, is the other easy way in. The district takes an hour or two on foot, but the alleys are irregular and look alike, so pin a café or the Arts Factory on Naver Map or KakaoMap before you set out. Dorimcheon (도림천), a stream with a walking path, runs along one edge of the area if you want to leave a different way.

For timing, a weekday from mid-afternoon into the evening gives you the shops at work, the low light, and the bars opening as the shutters come down. Café and bar prices are much like the rest of Seoul's. Opening hours vary and change often, so check each venue's map listing or social account, and the Arts Factory's own announcements for events. Parts of the district are being redeveloped, and a block you saw in a video may now be behind construction hoarding, so treat any screenshot as a guide to the mood, not an address. The mistake visitors make most easily is stepping through an open workshop door to get the shot. That doorway is the edge of someone's working floor, with machines running and steel moving, and the photograph from the alley is usually the better one anyway.