Mood: The mood of the video seems to be nostalgic and possibly melancholic, given the tagline 'Sometimes you can't let go of the past...without facing it again', indicating a reflective and potentially emotional journey. The overall theme appears to revolve around revisiting past experiences or relationships.

Environment: The setting appears to be a stylized, dreamlike or flashback sequence, given the presence of floating bubbles and a gradient background that transitions from blue to green. The exact location is not clear, but it seems to be an abstract representation rather than a specific real-world setting.