Kim Jong Un was meant to be their only idol - then North Koreans found K-pop - BBC News

Defectors tell the BBC that despite restrictions, K-pop has cut through in the stifling dictatorship.

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Watch: Songs that changed how some North Koreans saw the world

On a sunny Saturday in June, Lee Yeon-su took the day off from work and hopped on a train from Seoul to Busan for yet another concert by pop supergroup BTS.

It was her third time in as many months.

She had been in the crowds that poured into central Seoul in March, when the septet launched their comeback - but the stage was too far away. In April, on the first day of their world tour, the rain poured down, drowning out the singers' voices. But this time in Busan, it was "incredible".