Mood: The mood of the video seems to be dark, intense, and romantic, hinting at a thrilling love story. The theme appears to revolve around a tumultuous relationship, possibly with elements of danger or obsession. The use of 'Killer Love Story' suggests a blend of romance and suspense or even horror.

Environment: The environment or setting of the video is not explicitly clear, but given the dark background and the focus on the characters, it might be set in a dimly lit or private indoor setting. The lack of a detailed backdrop suggests that the focus is more on the characters and their interaction rather than the environment.