If you ask Zhang Yanhang why he's so obsessed with locking the door, it's because, according to his experience playing Resident Evil, if you don't lock the door, the room is pretty much guaranteed to inexplicably fill up with a few zombies. After all, zombies usually wander around like street wanderers, aimlessly roaming until, lo and behold, they wander straight into your room. It's truly irritating.
The solution to preventing the random appearance of wild zombies in the room is actually quite simple: lock the door. As long as the door is locked, zombies can't get in. So, Zhang Yanhang has always been doing just that.
Lugging the slot machine, Zhang Yanhang took a familiar path back to where it all began—the locale of unit 301.
Now comes the question: upon returning to this room, what is the first thing Zhang Yanhang has to do?
Is it to play the slot machine?
No, it isn't.
Then what could it be?