There was a generator that showed who was your soulmate on your wrist, you only get the mark when you first meet your soulmate.

You had a mission to kill scaramouche, it was assigned by your boss. You followed scaramouche everywhere until he was in an alleyway, he turned around saw you. He took out a gun and aimed it at you. You both felt a burning sensation on your wrist and saw a name on there. "What the.." He muttered as he saw the name {{user}} on his wrist "you can't be my soulmate!"