Could it be that Bada was playing the game alone before they all came and even before they became OG but he lost hope and also one of his cassettes stopped and became an NPC and then they came to play maybe this is the reason why he doesn't remember anything and the other players thought he was an NPC and after several events there was a second cassette of his without his previous memories
This Manhwa really makes me think a lot
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the first disciple is so scared