Mood: The mood of the video appears to be romantic and nostalgic, with a hint of eeriness or fear, as suggested by the tagline 'Fear Strikes Again' in the context of '1920 London'. The theme seems to revolve around love and possibly the supernatural, set in a historical period.

Environment: The setting seems to be outdoors, likely in a park or a large garden in London, given the lush green background and the attire of the characters. The period setting appears to be the early 20th century, specifically the year 1920, as indicated by the text '1920 London'.