Mood: The mood of the video appears to be romantic and playful, with a mix of intimate and casual moments between two people. The theme seems to revolve around love, relationships, and possibly friendship, given the title 'Hum Tum'. The overall emotion exuded is lighthearted and affectionate.

Environment: The setting of the video seems to be an urban or city environment, possibly at night, given the presence of streetlights. There are also hints of a casual, everyday setting with people dressed in modern attire. The presence of rain in one of the images adds a dynamic and possibly dramatic element to the environment.