Why N Seoul Tower changes colour at night, and how to get up there

On a clear evening N Seoul Tower (남산서울타워) glows blue on its hill above the city. On a bad one it turns red, and people across Seoul know without checking a phone that it has been a mask day. It is a landmark that doubles as a public notice board.

Visitors from abroad do look up. In an analysis published in July 2026 by the Seoul city government and the Seoul AI Foundation, N Seoul Tower had the highest share of foreign visitors of the 16 attractions studied, at 55.7 per cent. It also averaged about 57,370 foreign visitors a day in 2025, second in raw numbers only to Myeongdong (명동). One reason people join that queue is a cartoon: the animated film KPop Demon Hunters, which began streaming on Netflix in June 2025 and ends with a concert at the foot of this tower.

The colours have a meaning, the film got some things right and some things wrong, and private cars are not allowed up the hill. All three are explained below.

In short

N Seoul Tower is lit blue, green, yellow or red every night by the Seoul Metropolitan Government to show the day's fine-dust level.

Cars cannot drive up Namsan: take the cable car from Myeongdong (adults ₩15,000 return), the 01A/01B bus or the trail. The plaza is free; the observatory is ₩29,000.

Arrive about an hour before sunset. October and November are the clearest months; March to May is when Asian dust can arrive.

What the colour of N Seoul Tower tells you

The lighting is run by the Seoul Metropolitan Government, not the tower's owner, and it reports one thing: fine dust. From sunset until 11pm (10pm in winter) the tower is lit in one of four colours, set by the day's concentration of particulate matter. According to the operator's own page, blue means the air is clear and red means pollution is high or a fine-dust warning has been issued. Green and yellow sit in between, for fair and bad. The operator publishes the bands used: 0–15 micrograms per cubic metre is Good, 16–35 Fair, 36–75 Bad and 76 or above Extremely Bad.

That is not the whole story of the lights. The city has borrowed the tower for campaigns, and in October 2020 it lit N Seoul Tower and several other landmarks pink for a month-long Pink Light Campaign, according to the Korean government's news service. A pink tower is a message too, just not one about the air.

For a traveller the colour is useful. Asian dust reaches Seoul sporadically in spring, roughly March to May, and a red tower is a good reason to swap tomorrow's walk up Namsan (남산) for a museum. A blue tower is the opposite instruction. Go up, because the view depends entirely on how far you can see.

What the film got right, and what it made up

In KPop Demon Hunters the villains, a boy band called the Saja Boys, perform their song "Your Idol" to a stadium crowd at the base of the tower while the demon king Gwi-Ma makes his move. The scene is the film's climax, and the tower appears several times before that as shorthand for Seoul. There is no stadium on Namsan. The tower's base is a plaza with shops, restaurants and a lock-covered fence, and the summit is a public park with room for a crowd of tourists but not for a K-pop concert. What the film borrowed was the silhouette, and the silhouette is real.

The film has also revived an old naming muddle. The Korean name is Namsan Seoul Tower. VisitKorea, the national tourism organisation's site, lists it as N Seoul Tower, the branding the tower has carried since 2005, and that is the name most people type into a search box. The owner, the broadcaster YTN, now brands the whole complex YTN Seoul Tower on its official site. Older guidebooks say Namsan Tower or simply Seoul Tower. They are all the same 236-metre structure. VisitKorea describes it as the first multipurpose tower in Korea, a broadcasting mast combined with a public observatory, and it opened to the public in October 1980.

Both the Korea Tourism Organization and Visit Seoul, the city's tourism site, now publish guides to the film's locations, and the tower, Bukchon (북촌) and Naksan (낙산) are on both. The sensible order is Bukchon and Naksan by day, the tower at dusk.

What you actually get at the top

The cable car and the buses both drop you at the plaza below the tower. The fence around the terrace is the famous one, dense with padlocks left by couples. The first locks appeared in 2006, and by the following year the tower was promoting them as an attraction. A large pink heart sculpture in the middle is covered in handwritten messages.

The plaza is free. The observatory is not, and this is the decision to make before you queue. Adult admission is ₩29,000 as of VisitKorea's listing, which buys the observation floor and its view of the whole city. On a clear day it is worth it once; on a hazy one the outdoor terraces at plaza level show you most of the same skyline for nothing, and the money is better spent on dinner. The plaza also holds shops and restaurants, and the operator promotes a media-art installation it describes as the world's largest OLED structure.

Namsan itself is a park with a circular walking trail around the hill, and the walk down is pleasanter than the walk up. If you want the terrace to yourself, the only reliable way is to be there before the cable car starts at 10am, which means the bus or the trail.

The hour to arrive

Go up in daylight and come down in the dark. That is the whole strategy, and it means arriving roughly an hour before sunset, watching the city go from grey to gold to lit, and seeing the tower's own colour switch on above you. It also means the busiest hour on the hill, because everyone has read the same advice. A weekday is quieter than a weekend, and the cable car queue is the bottleneck.

The view from the park itself, before you pay for anything, takes in the Han River (한강) to the south-east with its lit bridges and the single needle of Lotte World Tower (롯데월드타워) on the horizon. That is the picture most people come for, and it is available from the terrace at plaza level.

Seasons matter more here than at most Seoul sights because the view is the point. From October the summer cloud gives way to drier, clearer weather, so October and November (autumn in Korea, spring at home in Australia and New Zealand) are the months to aim for. January averages around minus 2°C and regularly drops below minus 10°C. That is cold in a way southern-hemisphere visitors are rarely dressed for. July and August are hot and humid, with temperatures reaching 35°C and the monsoon running through June and July, so a summer evening is far more pleasant than a summer afternoon. Spring, March to May, is the season to read the tower's colour before you decide to go.

Allow an hour if you only want the view and are taking the cable car. Allow half a day if you plan to walk the trail, wait for dusk and stay for the night skyline.

Sun, dust and skin on a Namsan day

An afternoon on Namsan is an outdoor afternoon: a walk from Myeongdong Station, a wait in a cable car queue and a terrace in full sun. Korean sun care is built for exactly this, and the format worth knowing is the sun stick.

A stick is a solid bar of sunscreen in a twist-up case. It is made to be applied straight from the case, over make-up and without hands. Two examples from the store's current range are the CNP Laboratory Derma Shield Sun Stick, labelled SPF50+ PA++++ in Korea, and the Su:m37 Sun-away Velvet Sun Stick, which carries the same Korean labelling.

The other half of the routine is the evening. The Korean double cleanse, a balm or oil first to lift sunscreen and make-up and then a water-based wash, exists for days like this one, and a yellow or red tower is the local cue to do it properly. The BANILA CO Clean it Zero Cleansing Balm is a balm-type first cleanser of exactly that kind. None of this is medicine. It is simply what a city that reads its air quality off a tower does at the end of an outdoor day.

Practical details

Namsan is closed to private cars; the operator states this plainly on its parking page and lists car parks at the bottom of the hill. You go up by cable car, by bus or on foot.

• Cable car from Myeongdong: from Myeongdong Station (Seoul Metro Line 4) the lower station is about 570 metres on foot, with the Namsan outdoor escalator taking you up the last slope. The escalator runs 9am–11pm and is closed for inspection on Mondays from 9am to 2pm. The cable car runs 10am–11pm daily; the ride takes about three minutes. Fares as listed by Visit Seoul: adults ₩15,000 return or ₩12,000 one way, children ₩11,500 return or ₩9,000 one way.
• Bus: Namsan circular buses 01A (every 6–9 minutes) and 01B (every 15–18 minutes) run 6.30am–11pm and are cashless, so you need a transport card. Board from Chungmuro Station (Line 4) Exit 2 or Dongguk University Station (Line 3) Exit 6.
• On foot: the Namsan circular trail reaches the summit from several sides; the cable car up and the trail down is the easiest combination.
• Observatory: Monday to Friday 10am–10.30pm, Saturday and Sunday 10am–11pm. Adults (13 and over) ₩29,000; children aged 3 to 12 and seniors 65 and over ₩23,000. The plaza and terraces are free.
• Lights: sunset to 11pm, or 10pm in winter.

Hours and fares change, so check the operator's site at seoultower.co.kr and the VisitKorea listing before you go. If this is a first trip to Korea, check the current K-ETA rules for your passport at k-eta.go.kr before you fly; the requirements change and are not worth guessing.

The best first move on landing is not the tower at all. Do Myeongdong in the afternoon, walk to the cable car with an hour of light left, and let the colour above you decide whether tomorrow is an outdoor day. The sun sticks and cleansers mentioned here ship direct from Korea in their current editions, with free delivery to Australia and New Zealand.