One day the universe thinks about creating a love that can't be exist .
So it ask it's neighbor universe they also thinks it's a unique idea so they trying to find a planet so that the love story can be created. they find the planet earth to execute their plan.
Hence it's the love story of FIRE and WATER
Within Some days a girl and a boy born on the earth they are like humans but the girl have problem like she can't be going out when presence of sun and also the boy had problem like he don't like to going out night time . It's because the universe choose these both for their story so the girl is like water the boy is like fire.