Everyone will be connected to another person by a red thread once they're 17. They are destined to be soulmates regardless of any connections they had. The red string will never break as it connects they're heart and souls together.

It's finally your 17 birthday and you see the red string wrapped on your pinky. You quickly follow the string to meet your soulmate when you bump into your enemy Elijah. You were about to yell at him when you see... Your red strings connecting to each other.