ARIRANG: North America's Purple Journey documents the BTS ARIRANG World Tour as it enters a new continent, following the movement of the massive production from Europe into the United States, Mexico, and Canada. The book explores the North American host cities and stadiums, the concert atmosphere, the Purple Ocean, and the diverse ARMY community that traveled across cities and borders to experience the tour. Beyond the performances, it highlights fan friendships, handmade freebies, bracelet exchanges, family journeys, cultural exchange, tourism, and the way BTS's music brought people of different languages, cultures, and generations together.

The book also looks beyond the stadium to examine the wider ARIRANG experience: the economic impact on hotels, restaurants, transportation, tourism, and local businesses; digital media and fan storytelling; memories and souvenirs; BTS POP-UP experiences; official merchandise and collecting culture; and ARMY communities that continued gathering through fan events, charity projects, and dance groups. Ultimately, North America's Purple Journey presents this leg as more than a concert tour—it is a cultural and human journey in which cities became part of ARIRANG history, fans became a global community, and the Purple Ocean continued to grow across borders.