On June 10, Big Hit Entertainmentreleased a statement informing the news via BTS' fan cafe. They said, "BTS' Jin quickly left after receiving the news that his grandmother has passed away, after the pre-recording session for SBS' 'Inkigayo'. We would like to apologize to the fans as he was unable to wrap up/complete the broadcast. Rest in peace."
source from allkpop
I know how hard it is to lose someone and I'm sure everyone has too. my prayers are with him and his family at this time.