Three members of the K-pop superstar group BTS have tested positive for the coronavirus after returning from abroad, their management agency said. RM and Jin were diagnosed with COVID-19 on Saturday evening, the Big Hit Music agency said in a statement. It earlier said another member, Suga, tested positive for the virus on Friday. All three received their second shots in August, the agency said. BTS is a seven-member boy band. The four other members are J-Hope, Jungkook, V and Jimin. According to the agency, RM has exhibited no particular …