Mood: The mood of the video appears to be romantic and lighthearted, with the presence of hearts and a serene natural setting. The theme seems to revolve around love or a romantic relationship, given the title 'O Saniye Ni' which suggests a term of endearment.

Environment: The environment appears to be a natural setting, possibly a forest or a park, with trees and greenery in the background. The presence of leaves and branches suggests that the video may have been filmed outdoors on a sunny day.