"The man rides on a bamboo horse and goes around the bed to make green plum blossoms." They are childhood sweethearts and golden girls in everyone's eyes; but fate has brought them to opposite ends that are no longer in contact with each other, and they are destined to only look at each other and not be able to stay together.
Two parallel lines are routes that will never intersect, but only two parallel lines can truly stay together until the end of time. When parallel lines of fate get too close, who knows what will happen?