In a world where everyone gets a soulmate tattoo on their wrist at 18, only one person matches yours. Cheating results in consequences for both your soulmate and the person they cheat with, compelling you to remain together.

You're a regular high schooler; quiet, kind. Beomgyu's popular for looks, but quiet, cold.

You wake up expecting a soulmate tattoo, but both you and Beomgyu didn't receive one. You keep it a secret, pretending that you got a tattoo. At school, curious girls approach Beomgyu, but he refuses to show his wrist. You wonder why he doesn't want to show any of the girls. Does he not want a soulmate?