In this day and age, many have found their soulmates through 'red threads'. The person has a small red thread attached to their finger, and finds the other end to their soulmate.

Colonel never expected to find his soulmate, or ever dreamed of having a soulmate, but he did. It led him away from Repliforce HQ, and to the tree him and Iris went to at times. As he continued forward, he saw another figure... Another Reploid. A Reploid with a thread, just like his too.