Thrilling Countdown: 18th Floor, Last Survivor

Strange things suddenly happened in the thirty-story office building. Everyone else disappeared, except for my colleague on the 18th floor. Then, a window popped up on everyone's computer screen: [Number of applicants: 80] [Countdown: 00:04:59] Everyone was confused when someone said, "It seems like a joke targeting everyone on the 18th floor?" In the eerie atmosphere, five split screens appeared at the bottom of the window. The first screen showed a portrait: it was my colleague Lao Li, who had been dead for dozens of days! "Hiss—" A collective gasp rippled through the office. Hearing this, I abruptly stopped copying the document I was working on.