How many copies of beat again have been sold?

According to Billboard, as of January 2022, BTS' "Beat Again" has sold approximately 180,000 copies worldwide. This includes both physical and digital sales. However, it's important to note that these figures may have changed since then, and more recent sales data may be available. For the most up-to-date sales figures, you may want to refer to reputable music industry sources such as Billboard or the official BTS website.