In episode 6, there was a scene where the centipedes were crawling towards Siwon while she was wiping her hands. Was it because she had just finished cursing her own mother using her own blood and the curse now wanted her life? Then, does that mean Siwon's mother protected her own daughter from the aftereffects of the curse even though she was the target of said curse?
Time is different from real world. They were probably rich to pull this off by bribing. Maybe the simulation was…
One of my theories is that the students were perhaps on a bus in the real world and were told it was for a "school trip") but the bus was actually headed for the place where they were going to be kept. Then, maybe towards the end of the journey, sleeping gas was somehow deployed in the bus to get them to fall asleep (similar to that of the movie "Battle Royale") so that it'd be easier to carry them to the facility. That means the bus driver would have to be bribed as you said.
As for the time difference, assuming each simulation only takes one second, then I suppose it is possible for the students to be kept there for under a day.
how did se eun's parents gather all of Se Eun's classmates in one place and make them all play a simulation? Also, assuming they were kept in that place for more than a day, wouldn't the police have come knocking trying to find them since they would be reported missing by their parents?
As for the time difference, assuming each simulation only takes one second, then I suppose it is possible for the students to be kept there for under a day.