"Remember the alchemist's wife who came back to life and that figure clad in a rubber suit that appeared and disappeared into thin air,"
Li Ang pinched the keychain he had obtained in Room E between his fingers, gave it a flick, and made the keychain with its seven keys jingle.
"These seven keys each correspond to Rooms A through G.
"The back of each is marked with a number:
"0, -72, 72, -24, -48, -2, -0.
"At first, I couldn't understand the meaning of these numbers, thinking they were digital lock codes or combination lock codes for safes.
"It wasn't until I entered Room F at 10:05 and got the letter."
He said slowly, "The letter from Room F instructed me to put the sugarcane into the feed chute of Room F, so that the machine in Room A could produce battery fluid, claiming that producing the battery fluid would take at least two hours, and if I hadn't entered Room F by ten o'clock, I would miss the final chance.
