Mood: The mood of the video appears to be melancholic and introspective, with a sense of longing. The title 'Alone' suggests that the video may be about feelings of isolation or solitude. The overall theme seems to be related to heartbreak, loneliness, or a sense of disconnection.

Environment: The environment or setting of the video is not explicitly shown, but based on the background, it appears to be an urban or industrial setting with a dark and moody tone. The red background with a faint cityscape or bridge suggests a nighttime setting with a focus on the emotional state of the individuals rather than the physical environment.