Mood: The mood of the video appears to be intense and dramatic, with a sense of passion and energy. The theme seems to revolve around heartbreak, loss, or a deep emotional turmoil, as hinted by the title 'Heartless'. The overall emotion conveyed is one of melancholy and possibly even despair.

Environment: The setting of the video seems to be outdoors, with a rocky terrain and a blue sky with clouds in the background. The contrast between the black-and-white portrait of the woman and the colorized image of the man on fire suggests a blend of realism and stylized visuals. The environment may be a representation of a tumultuous or fiery emotional state.