The demolition alleys in the old city are cooler than the office buildings, but as stuffy as an upside-down vat. When the water reaches the ankles of the canvas shoes, you can smell a mixture of rust and rotten leaves, mixed with the aroma of oil from the late night snack stall in the distance. Lin Yu kicked away the broken bricks at his feet, and a woodlice crawled out from the cracks in the bricks. Carrying a translucent shell, it crawled into the cracks at the base of the wall - at this time, he saw a faint blue stream of light emerging from the foxtail grass at the base of the wall.