Tens of thousands of fans filled a rainswept stadium in South Korea on Thursday to watch BTS kick off their world tour, as the K-pop megastars ride the momentum of a chart-topping comeback album and a landmark performance in the heart of Seoul.

The seven-member group -- widely regarded as the world's biggest boy band -- took to the stage together for the first time last month following a years-long hiatus prompted by mandatory military service, and after releasing their latest studio album "ARIRANG".

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