FlowBack is a 4, formerly 5 member Japanese boygroup under Ki/oon Music (Sony) who debuted in 2016. The member are Tatsuki, Judai, Masaharu, and Reiji. The group was found trought the "LINE Audition" in 2014 where over 125K participants apeared. In October 2021 the group announced their depature with their agency Zest inc. Shortly after member Mark announced to leave FlowBack in November.