From trains that speed through huge apartment blocks to floating restaurants and mini 'towns' on the rooftop of soaring ...

because you never know which floor your destination is on. Professional "designated driver" Shen Xun takes the film’s viewers along on his journey through Chongqing's raucous nightlife ...

"In Chongqing, we never know which floor we're ... But if we go there [to the edge] now we're on the 22nd floor. But if we use the elevator on the square, it says we're on the 12th floor.