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 'Kho Sa Gaya Hoon' which translates to 'I have lost'. The overall emotion conveyed is one of sorrow and yearning.

Environment: The setting of the video seems to be a dimly lit, possibly indoor location with a warm color tone. The exact setting is not clearly discernible, but it appears to be a stylized, cinematic environment. The focus is on the emotional expressions of the lead actors rather than the physical setting.