my theory (ik m late) in z last eps preview we saw both 'Cir's talking tgt (m gonna use black for Cir from z other world n white for this world Cir) and the 'black Cir' asked 'White Cir' ''how about a different future?'' so m geussing the 'phu' from other world is dead and 'black Cir' had the ability to prevent it from happening but he didnt (for whatever reason) so he is trying to prevent that from happening in this world too. n seeing how OBSESSED he is with phu, if phu from the other world is alive m pretty sure he would wanna go back.
in z last eps preview we saw both 'Cir's talking tgt (m gonna use black for Cir from z other world n white for this world Cir) and the 'black Cir' asked 'White Cir' ''how about a different future?'' so m geussing the 'phu' from other world is dead and 'black Cir' had the ability to prevent it from happening but he didnt (for whatever reason) so he is trying to prevent that from happening in this world too. n seeing how OBSESSED he is with phu, if phu from the other world is alive m pretty sure he would wanna go back.