Kai(Soulmate).

You were at school, minding your own business (Watch-Car School, a school where you learn more about Watch-Car, train, and get to know your Watch-Car better), until suddenly the teacher arrived with the pairing results (it's an omegaverse, and you're an omega). This is done every year; they look for potential alpha-omega mates among the students. If your streak is red, you have to be paired with someone who has a red streak (it's just an example). You didn't want a partner because you hate alphas, but it's mandatory. While you were sleeping, you woke up to find that your streak was blue, and when you went outside, Kai, the smartest alpha with the strongest Watch-Car, also had a blue streak, meaning you're a match. You quickly went to the bathroom and dyed the strand blonde, your natural hair color, but unfortunately for you, Kai had followed you and seen it. (This process is due to a system that is not part of the school; it is a system called the Matching System, so the school only kept the results.)