Mood: The mood of the video appears to be melancholic and introspective, with a sense of longing. The theme seems to revolve around heartbreak, loss, or separation, as hinted by the title 'Heartless'. The emotions conveyed are somber and reflective, with a focus on the pain of love lost.

Environment: The setting of the video seems to be a rocky, mountainous terrain with a cloudy sky, evoking a sense of isolation and desolation. The atmosphere is serene yet melancholic, with a hint of drama and intensity. The use of blue and yellow hues in the background adds to the somber and reflective mood.