Why the Whole Arena Changes Colour at a K-Pop Concert: Following One Question to the End

A first-time visitor to a K-pop concert usually has the same experience around the third song. Thousands of lightsticks, which a moment ago were scattered colours, turn blue together, then pulse, then sweep red across the whole floor. Nobody in the audience pressed anything.

That moment raises one question, and the answer to it raises the next. This article follows the chain of questions in order, from the lightstick to the chants to the merchandise queue, and says where the answers run out. Everything was checked on 9 October 2026.

Four terms first

• 응원봉 (eungwonbong), lightstick: the official handheld light that fans carry to a concert.
• 응원법 (eungwonbeop), fanchant: the fixed shouts and cheers fans perform at set points in a song.
• 떼창 (ttechang), group singing: the audience singing along together, often on the chorus.
• MD: short for merchandise. In Korea, concert goods are called MD.

Where the stick came from

Before the lightstick there was the balloon. Korean coverage places the origin of fan cheering gear in the late 1990s, with first-generation groups such as H.O.T., Sechs Kies and god. Fans of that era waved coloured balloons: white for H.O.T., yellow for Sechs Kies, purple for S.E.S, red for Fin.K.L, orange for Shinhwa and sky blue for god. The report says the colour system hardened after the H.O.T. and Sechs Kies fandoms became rivals and needed to show clearly which side they were on.

As more groups debuted, colours began to collide. One account says that when SE7EN debuted in 2003 there was no colour left, and a glow stick bent into the shape of a "7" became his cheering tool. A Chosun Ilbo report credits SE7EN's agency with replacing the balloon with a 7-shaped glow stick. It then dates the culture of waving a stick that gives off its own light to Big Bang's crown-shaped "Bang-bong", launched for the fandom VIP. Which of these counts as the first depends on how you define a lightstick, and the sources differ.

LED sticks followed in the 2010s. They solved the dark-arena problem, but early LEDs made only a few colours, so fandoms overlapped again. The multi-colour, remote-controlled stick that came next is the one this article is about.

Question one: Is someone controlling the lightsticks?

Yes. Official lightsticks contain a Bluetooth module, and during the show a production team sends colour and brightness commands to all of them at once.

The idea is older than it looks. Korean patent filings describe a show-control system in which a smartphone app holds a unique code and seat information, and a central controller collects the seat of each paired device. A Korean column on the subject says the setup works like this: a fan enters a seat number in the app, and staff at the venue then change the colours through central control.

The EXO concert at Seoul's Olympic Gymnastics Arena on 22 July 2016 is often cited as an early use. Korean accounts describe lightsticks controlled over Bluetooth that changed colour together and switched on and off with the music. In one segment, when a member who plays a fire-powered character snapped his fingers, the whole audience turned red. The same column says the feature then spread to BTS, SEVENTEEN and TWICE. Fan discussion disputes whether EXO was really the first, and I could not settle that, so I will say only that it was an early and well-known case.

Question two: How does my lightstick know where I am?

This is why the colours look like a pattern and not a random mix. Because the system knows the seat of each stick, it can in principle address different parts of the venue differently. One technical explanation describes the venue as divided into zones, though it is a blog-level description and the real protocols are proprietary. Fans enter their seat details in the app before the show, and the stick is paired to the phone.

The app itself shows how this works. On the store page of ENHYPEN's official lightstick app, the preview screens show two modes, Concert Mode and Self Mode. In Self Mode the user picks any colour from a wheel and sets the brightness. In Concert Mode the app lists the event, in the screenshot a 2021 ENHYPEN fan meeting at Blue Square Mastercard Hall on 6 February 2021 at 18:00, and asks the user to enter seat information. It repeats the instruction to enter the seat accurately, and a button at the bottom reads 직접 좌석입력, "enter seat manually".

Two practical things follow, both from fan guides and not from an official source. One guide says that before the show you hold the stick's button for about three seconds to put it into "performance mode". Another says that only official sticks that have been authenticated through the app join the shared display, and that an unofficial or outdated stick stays one colour while the arena moves together. Details differ by group, so the instructions for your group's stick are the ones to follow.

There are costs. The Korean column notes that fans of an expensive concert may also have to buy a Bluetooth-enabled stick, and that a few pairing errors can disrupt a shared display. It also argues that once multicolour LEDs and central control arrived in the mid-2010s, the colour of a stick lost much of the meaning it used to carry. A stick today is less a flag for a fandom's colour than a pixel in a screen made of the audience.

A word on cost, since a first-timer will meet it. A 2024 Newsis report put the average list price of an official stick at ₩20,000 to ₩50,000, and said sticks for popular groups often sell out within minutes of going on sale. Shop listings I found in 2026 ran from about ₩47,000 to ₩85,000, though some of those were resale prices and one was a bundle with other items. Whether batteries come in the box differs by product, so the product page is the place to check. The same coverage mentions that sticks can be rented, usually for about half the list price, and that fans without one can still enjoy a show with a slogan banner or a fan board.

Question three: If the sticks handle the colours, what is the audience doing with its voice?

Chanting. Fanchants are the fixed shouts that fans perform at specific points in a song. The pattern for each song is published, by the agency or by fan accounts, and at a concert thousands of people do it on the same beat.

The question of where to learn them has a practical answer. Guides say official fanchant videos are published by agencies and fan accounts, often around a comeback. One guide says the first official fanchant for a new song is usually settled within two to three days of release. As an example, JYP Entertainment showed a fanchant video for NiziU alongside other comeback content on the group's official channels.

Guides suggest priorities.

• The member-name chant. One guide says the chant that introduces each member during the first song is the one to learn if you learn only one.
• Rhythm before pronunciation. If a Korean syllable is hard, being on the beat matters more than getting it right.
• The official version. Fans generally follow the official pattern so that the sound stays together.

On timing, the guides do not agree. One suggests four to six weeks, another two to three weeks, another fifteen minutes a day on one song at a time. Past concert fancams, recordings of the crowd, are said to be useful because you hear the chant in context. These are blog-level recommendations, so treat the specific numbers as rough.

Question four: Do seat tiers change what you see and do?

This is the question where I could not follow the chain with confidence. I found no verifiable, sourced account of how a floor seat, a lower tier and an upper tier differ in view or in how the crowd behaves. What can be said is narrower and comes from the lightstick system above. Your seat is data as well as a place, because the stick reports a position to the show.

Question five: When should I buy merchandise?

The queue for concert goods is one of the most discussed parts of the day, and the answers here are about process more than timing.

I found no published figure for waiting times. One review says an hour in the merchandise line is nothing unusual at big shows, and one viewing guide suggests joining the line three to four hours before the show. These are individual experiences, and they vary a great deal by show.

What is documented is that organisers now offer ways around the line. These examples are from 2026 notices, and each shows a different model.

• Pre-order and collect on site. A fan concert by Park Ji-hoon took online pre-orders from 12 to 19 May, accepted applications from buyers who wanted to collect on site, and sold on site at KINTEX on 30 and 31 May. A fan meeting by the same artist took pre-orders from 3 to 12 April, with on-site collection on 25 and 26 April at a booth inside Yes24 Live Hall.
• On-site only. MAMAMOO's 2026 world tour sold goods only at the venue, on 19 to 21 June, with a limited quantity per show. The organisers warned that items could sell out early.
• Ticket holders only. For Lee Young-ji's world tour, the notice said the concert goods could be bought only by people holding a ticket.
• Card only, with limits. At one Korean show by a Japanese singer, sales ran for about an hour after the performance, took only cards and mobile payment, and capped purchases at two of each item.

A service called B.Stage added an on-site pickup feature. A fan pays in the app beforehand, receives a QR code, and shows it at the pickup booth after an in-app notification, so there is no sales queue. Whether you can use any of these depends on the show, so the official merchandise notice is the thing to read first.

An older notice shows the pickup model in detail. A fan-meeting merchandise guide headed "Chronograph" set up a pickup booth at Blue Square Mastercard Hall, open on Saturday 5 February from 15:00 to 17:00 and Sunday 6 February from 14:00 to 16:00, with no courier delivery. Its own text dates it to 2022, because unclaimed orders were to be cancelled on 7 February 2022. Buyers had to bring a photo ID whose name matched the order, and the order confirmation. Other rules in the notice: a mask was required; only the person named on the order could collect it; unclaimed orders were refunded only to the original payment method, so a card payment could not be turned into a cash refund; a defective or missing item could be exchanged only at the venue on the day; and the venue sold no goods apart from these pickups.

The chain, in order

Following the question through gives a short sequence. The colours change because a central system controls Bluetooth sticks. The system knows where you are because you gave it your seat. The voice part is covered by fanchants, which are published in advance. The goods are the part you can plan around, by reading the notice for presale and pickup.

What I could not find

• How seat tiers differ in what you see and how the crowd behaves. No sourced account.
• How long merchandise lines take. No published figures, only individual reports.
• Whether EXO's 2016 concert was the first use of seat-registered lightsticks. Disputed, and I could not settle it.
• How many fans pair their sticks correctly. No data.

Before you go

• Pair your stick the day before. Enter the seat on your ticket, so the app is ready when the show starts.
• Learn the member-name chant. It is the one most guides agree on.
• Read the merchandise notice for presale and pickup. The format changes with the show.
• Use the official stick for your group. Unofficial ones are reported not to join the shared display.