The World card reveals that your upcoming future lover is a friend who becomes a lover. For example, a friend from childhood or a classmate or someone you have been friends with for a long time.
You may not have been aware of them as someone of the opposite sex for a long time, but one day you will realize a lot of new and interesting things about them. From there, everything will quickly develop into a romance. Because you have been friends for a long time, you two understand each other very well, going together will feel comfortable. You may even get married in the not too distant future.