Mood: The mood of the video appears to be romantic and intimate, with a sense of longing. The theme seems to revolve around love and separation, as suggested by the title 'Tere Bina' which translates to 'Without You'. The overall emotion conveyed is melancholic and sentimental.

Environment: The setting of the video seems to be a dimly lit, indoor location with a blue background that adds to the melancholic mood. The couple's attire suggests a formal or semi-formal setting, possibly a period-specific or vintage-inspired backdrop, given the title '1921'.