A man lies dead in an empty alleyway. Detective Lee arrives, seeing nothing out of the ordinary. His partner spots a lone, bloody footprint on the ground. Rain falls steadily, obscuring any possible evidence. Orchids bloom on the wet cobblestones, strangely untouched. Passersby, oblivious, quickly hurry past the crime scene. An overhead lamp flickers, casting eerie shadows around. A window nearby is darkened by heavy curtains. Empty bottles litter the street, hidden under darkness. Questions swirl in Detective Lee's mind, as likely clues.