After racking his head for ideas, Jiang Fei came up with something. A probable impossibility, at worst, an improbable possibility at best.
Jiang Fei first collected all the Ant Eggs and Ant Milk for that day and contacted Big Brother Bear. He had Big Brother Bear schedule shifts to keep the Secret Dungeon under guard around the clock. Since the Secret Dungeon was a solo dungeon, one person had to remain within it to shut off its access to the world.
