From what I understand there’s the Ghost Muni(evil half of the MC) that created a replica of the evil master aka his original obsession. And the ml is the evil master reborn but not the same person bc he hasn’t lived that life uk? which is why ml has similar tendencies and characteristics but isn’t completely an ahole
Yes MC was reborn/reincarnated but he exist with his soul split into two - so there are three version of MC
The boss also reborn with the past soul stay intact to him. The ghost is actually one of muni's soul and created his own version of boss - so there are two version of original boss and an artificial one

Is MC reborn or the boss and ghost are same please explain anyone