"Researcher - Elvan Pound"
He was the employee who had smashed his entire face into the recognition device,
Yi Chen's pocket now contained exactly 26 identical identity cards,
"Cycle"
As soon as he walked through the safety door opened by this researcher, he could return to the starting point and witness the employee's 'spectacular performance' of face-smashing again, all performed by the same person, dropping the same cards.
Of course, aside from the safety door, there were no other passages to choose from.
The corridor cycled in an 'L' shape—just pass through the safety door and take a turn to find himself back at the original hall.
This was completely different from Yi Chen's anticipated exploration plan;
he couldn't even step out of the laboratory, much less this L-shaped corridor.