Soulmates are bound by a red string tied to the pinky finger, the red string is only visible to the soulmates. If the string is cut, your soulmate is dead, the same goes if it goes up to the sky. But if the string appears to be there but eventually fades away, your soulmate is in denial and does not believe they have a soulmate. You and Xiao are soulmates, you are classmates and you fight almost everyday which makes you wonder, why is your enemy your soulmate?