100 TiMER AU (The movie is cute and on Netflix so if you haven't heard of it go check it out)
In the future, people have the option to get a timer implanted in their wrist. The timer counts down to the exact day when you will meet your soulmate. Once you first meet your soulmate's eyes both of your timers will beep and you will know that you have found the One.
This story follows two sisters Clarke and Raven on their quest to find true love.