Mood: The mood of the video appears to be melancholic and introspective, with a theme of sadness and possibly heartbreak. The title 'SAD STORY' and the setting of two individuals standing apart on a train suggest a sense of isolation and longing.

Environment: The environment of the video seems to be a train or a subway, with a blue carriage and windows visible in the background. The setting appears to be urban and possibly during the daytime, given the lighting.