Lee Donghyuck is an amazing detective that just wanted a day off from work, but a case has him questioning everything he thought he had gotten over. He reunites with his brother, Lee Taeyong and his ex, Mark Lee when the case ties NCT into its roots. From there, old feelings rekindle and new bonds are formed. Can Donghyuck protect himself and his new family?

Hendery has always enjoyed watching other people's soulmate  rings change color, based on the emotions their mate was going through. His own ring has changed color several times, but usually stays a dark color. One day it turns black, a sign his soulmate has died, but it's wrong, since it hasn't crumbled.