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What if it's Doha who's the main player of the game while Bada is just an npc? I know it's been pointed out already, but the amount of control Doha has on the game is kinda weird, like how he's the only one who could kill the killer. Also, remember that bit on chapter 18 where Bae Hyungshin was able to retain his memories because he didn't eject his cassette tape? What if that's what Doha did to Bada? Maybe Doha has Bada's tape and is keeping it somewhere in a cassette player (that cassette player in the latest chapter perhaps?). This would explain why Bada became a sentient npc and thinks he's the main player.
OR if we stick to the Bada-player and Doha-npc theory, maybe it's Doha's tape in that sus casette player? And that's why he's trying to distract Bada away from the player, because he doesn't want Bada to discover the tape inside??? Agghhh the point is either Bada or Doha has their tape inserted in a cassette player somewhere, which could possibly be the reason why either one of them became a conscious npc.