I'm prettyy sure

This was all Doha's doing. His tape was actually never removed and he knows everything that happened since day one. He doesn't want the game to end cuz he wants Bada to stay there with him forever. Everything till now played in a way that Bada and Doha would get closer and Doha would turn into the only person Bada can rely on. I mean, even if Doha acts suspicious he's still the only one trying to help Bada. But I see his helping as just an act. He's too cold and merciless compared to the others. Even Bada that already died many times and saw others die too isn't so strong minded like Doha. He's just fishy. This could only end by Bada accepting Doha's obsession and staying with him or by living him trapped inside the game