The Eighteen Levels of Hell: Lying is Forbidden Here

The descending elevator stopped at the fifth floor.

Inside the elevator.

Geng Hao was slightly dazed.

'Shouldn't it have stopped at the fourth floor?'

'Why the fifth floor...'

'Chen Ran pressed the button for the fourth floor earlier. Does that mean once a button is pressed, that floor won't appear anymore?'

'No, that's not right!'

'After Chen Ran pressed the fourth floor button, the elevator dropped to the third floor.'

'Which means Chen Ran was running an experiment just now, and through that experiment, he discovered...'