The Love String.

It happened to everyone on January 1st of the year they would turn 17. Everyone got a red string tied around their ring finger that led to their soulmate. It was transparent of course, so no one would trip... But you still felt it, heavier the farther away the one was.

No string if they're dead

String going nowhere if they're too young

(ALSO SORRY IF I COPIED ANYONE JUST TELL ME AND I'LL CREDIT THEM! and if you think this is dumb and unoriginal then you can go away)