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As BTS kicks off its Arirang concert tour, here’s a guide to Seoul — from hotteok trails and K-pop music video studios to stationery hauls and long walks, all best enjoyed with a sweet potato latte in hand. As BTS kicks off its Arirang concert tour, here’s a guide to Seoul — from hotteok trails and K-pop music video studios to stationery hauls and long walks, all best enjoyed with a sweet potato latte in hand.