By Syndicated Content BIGHIT MUSIC BTS. Last week, the K-pop superstarsâ new single, âPermission to Dance,â replaced their hit âButterâ at number one after seven weeks. Well, âButterâ is now back at number one for an eighth week. That means itâs now tied the record for the longest-running number-one of 2021 so far: Olivia Rodrigoâs âDrivers Licenseâ also spent eight weeks on top earlier this year. As Billboard notes, BTS has now become the first act to replace itself at number one with a new song, and then have the first song return to number one â without any other songs holding the top spot between the two events.