Sebastian Król lives in Hamburg, where he founded the music agency Backseat in 2017 and the platform Fanklub in 2021. Backseat primarily does PR, plus label services, consulting and booking for the Norden Festival. Clients include acts such as Bilderbuch, Migros U, UCHE YARA, Black Sea Dahu, To Athena, DOTA, Ane Brun and others. Fan Club is an app on which bands and musicians can communicate with their fans and earn a regular income from their contributions. Sebastian Król also makes music himself under the name Karwendel.