This drame shows how people can be friends and appreciate each other despite of being on opposite sides.
Sometimes life get caught in the way and you can't be with the that person forever but it does not mean you can't cherish them. It tough to love be in love with someone and not being able to be with them but that feeling will grow on you and after some it's won't hurt anyone.
This drama really shows that not everything/person is forever which is fine because that what life is.