1865, Foggy season in London. Eliot Gresham, Third Secretary of the British Foreign Office, fell out with the Prussian officer Conrad von Stein over a political taunt at a diplomatic banquet. A glass of red wine was spilled on the military uniform, and an argument on the terrace almost started. A few minutes later, there was a loud noise in the study, and businessman Winterbourne fell to the ground. But the strange thing is that the two of them were not in the house at the time, but Elliot's cuffs had smoke reaction...
The two were taken away by Scotland Yard as the biggest suspects and released due to lack of evidence. However, they became the "Two Prisoners in Fog Harbor" that attracted the attention of London. In order to clear their grievances, they are forced to share clues, spy on each other, and tease each other. But when the mastermind behind the scenes began to show his fangs, they discovered that the only person they could trust turned out to be the person they hated the most.
Concept: Prejudice, nationality and class build high walls; love is the only innocence that does not require testimony.