Mood: The mood of the video appears to be romantic and upbeat. The theme seems to revolve around love and reunion, as hinted by the title 'Welcome Back'. The overall emotion exuded is one of excitement and joy, likely setting the tone for a celebratory and emotive musical experience.

Environment: The setting seems to be a vibrant and lively party or celebration, likely a nightclub or a festive event, given the presence of a crowd in the background and the bright, flashy lights. The environment is energetic and festive, with a sense of glamour and excitement.