A welcome banner hangs in Jongno-gu, Seoul, on the 19th, two days before BTS's comeback performance. /Courtesy of Hwang Chae-young

On the 19th, at a bakery cafe inside the Sejong Center for the Performing Arts in Jongno-gu, Seoul. In front of the cafe stood an A-board with a purple background, the signature color of BTS.

Store manager Yun Ye-rim, 23, said, "Among the seasonal menu items, there was a 'suga chewy cookie,' and since there is also Suga among the BTS members, we decided to sell it again," adding, "We came up with the idea and made a promotional A-board with purple."

A purple-background standee stands in front of a nearby cafe on the 19th, two days before BTS's performance at Gwanghwamun Square in Seoul. /Courtesy of Lim Hee-jae

As BTS is set to hold a comeback concert for its fifth studio album, "Arirang (ARIRANG)," at Gwanghwamun Square in Seoul on the 21st, the area has turned purple. With about 260,000 people expected to swarm in, businesses are moving quickly to secure more customers.

Restaurants are rolling out products tailored to BTS' fandom, "Army (ARMY)." One restaurant said it "wishes BTS success as a global artist," switched its indoor lighting to purple, and prepared a nacho menu with purple elements.

Store owner Mun Sang-gi said, "We made purple T-shirts for the staff to wear and produced about 1,000 norigae to match the album Arirang," adding, "With the BTS concert drawing global attention to Gwanghwamun, I wanted to contribute in some way."

Purple T-shirts for staff to wear are prepared at a nearby restaurant on the 19th, two days before BTS's performance at Gwanghwamun Square in Seoul. /Courtesy of Hwang Chae-young

There are cafes selling coffee topped with purple flowers, sushi restaurants preparing sushi with sauce made from purple sweet potatoes for the concert day, and restaurants planning to offer 1,000 bowls of Pyeongyang cold noodles for free on a first-come, first-served basis.

One cafe was selling ice cream made with the purple "lavender." A person surnamed Song, 66, who came to the cafe to buy lavender ice cream, said, "My whole family is Army," adding, "As a fan, I'm very happy to enjoy products like this timed to the comeback concert."

People hold purple ice cream sold at a nearby cafe and take commemorative photos on the 19th, two days before BTS's performance at Gwanghwamun Square in Seoul. /Courtesy of Lim Hee-jae

The Gwanghwamun branch of Kyobo Book Centre set up a section from the previous day introducing books recommended by BTS members. A hanbok lending shop near Gyeongbokgung Palace also began selling BTS merchandise.

Convenience stores hung banners reading "Welcome Korea" or placed balloons in stores that said "Welcome ARMY."

Since the previous day, media poles on Myeongdong Street have been showing videos welcoming BTS and Army. From 7 p.m. on the 20th, a "BTS Gyeongbokgung special film" will also be released on media walls around Gwanghwamun Square, including the Koreana Hotel. The video will play at 5, 25, and 45 minutes past every hour until midnight on the 21st.

A message welcoming BTS and the ARMY fandom plays on a media pole on Myeong-dong Street in Jung-gu, Seoul, on the 18th. /Courtesy of Jung-gu Office, Seoul

However, there are concerns that as traffic around Gwanghwamun Square will be controlled on the concert day, the number of customers may not meet expectations. An employee of a bar in Mugyo-dong, a person surnamed Kang, 57, said, "We prepared three to four times more ingredients than usual, but since we're in an alley, I'm worried not many will come."

Sejong-daero (Gyeongbokgung Palace to City Hall), where seating for the BTS concert will be installed, will have restricted traffic from 9 p.m. on the 20th. On the concert day, Sajik-ro, Yulgok-ro, Saemunan-ro, and Jongno near Gwanghwamun Square will also be controlled in sequence. Nearby subway stations—Gyeongbokgung, Gwanghwamun, and City Hall—will skip stops, and bus routes will be detoured.

Alert levels are also being raised in preparation for safety incidents. The government elevated the terror alert level around Gwanghwamun Square from "attention" to "caution." On the concert day, the crowd disaster risk alert will also be at the "caution" level. The National Fire Agency issued "Special Vigilance Duty No. 2" and is checking ambulance travel routes and more.

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