On your 18th birthday, you get a red string connected to your wrist. Only you and your soulmate can see this string. It connects you to them, always. You never necessarily went looking, but you did try to stray to the string's path once or twice.

You were in a rush this morning, and by your luck, a young man bumps into you. "I'm so sorry, please forgive me." He says, holding up his hands in a prayer type motion. That's when you notice the same red string tied around his wrist, connected to yours.