BEIJING (AP) — As mega K-pop group BTS returns to the stage after a hiatus of more than three years, one major market is conspicuously missing from its 12-month world tour: China. The omission of one of the group’s biggest fan bases comes as no surprise. In fact, just the opposite would have been huge news. China has blocked most South Korean entertainment since 2016 under an unofficial ban that also restricts movies and the country’s popular TV dramas. For some Chinese, that means flying to