London in the nineteenth century was like a pool of muddy water, mixed with all kinds of people. The Chinese who bought and sold opium, and the Indians who came to study abroad. Aristocrats from the upper class and little kids from the slums. The two protagonists met because of a tragic incident and never forgot each other. "Maybe the future will not be very beautiful, maybe our smiles will not be warm. But at dawn, the eyes are no longer dark." Police detective (Gong, John) x underground detective part-time job (Shou, Danny) who does almost everything, not so dark, detective drama.