South Korea has heightened its terror alert level in the capital city, Seoul, as preparations intensify for a high-profile concert by the K-pop supergroup BTS. The government announced on March 20, 2026, that the alert was raised from 'attention' to 'caution,' which is the second tier in a four-level system. This decision follows the prime minister's office's assessment of potential threats due to international affairs, recognizing the large gathering's vulnerabilities. The alert will remain in effect from Thursday until Saturday midnight, demonstrating the government's commitment to ensuring public safety during this major event. The outdoor concert is set for March 21, 2026, in Gwanghwamun Square, a historic site and civic plaza in front of Gyeongbokgung Palace. The square is uniquely suited for national ceremonies and important gatherings, making it a significant venue for BTS's first concert in four years, following the group's hiatus to fulfill mandatory military service. This concert marks a special moment in their comeback, coinciding with the release of their new album, Arirang, expected to boost the country's cultural influence worldwide. In preparation for the event, approximate crowd predictions indicate up to 260,000 attendees, prompting organizers to increase capacity from the initial 15,000 ticketed spots by adding new standing areas. With police estimating these numbers at their performance stage, the safety measures are extensive. The Seoul Metropolitan Police Agency announced the deployment of 6,000 personnel to manage crowds and address any public disturbances, especially in choke points around the venue. This follows concerns stemming from a previous incident in Seoul, where a Halloween crush tragically resulted in 159 fatalities. Many international fans have flocked to Seoul to witness BTS live, creating an anticipatory atmosphere across the city. Fans like Sodikjonova Shakhrizoda express excitement at being in the same places the band has been, while others feel a sense of nostalgia about traveling to Korea. Some traveled long distances, only to find their trips coincided with the concert dates. This wave of global fandom reflects BTS's significant cultural footprint and the powerful connection they maintain with their audience, illustrating the unique phenomenon of K-pop and the strength of the BTS ARMY around the world.