Mood: The mood of the video appears to be romantic and sentimental, with a focus on love and relationships. The theme seems to be centered around Valentine's Day, given the title 'Valentine Mashup 2019'. The overall emotion evoked is one of warmth and closeness, with the images of couples embracing and gazing into each other's eyes.

Environment: The environment or setting of the video seems to be a mix of intimate and public spaces. The couples are shown in close-up shots, suggesting a private and personal connection. However, the presence of a crowd in the background of one of the images implies that the video may also explore public displays of affection or romantic moments in a more social setting.