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Is it rare for someone to want to get to know you? No, it's not. Especially for someone like you.
Like yesterday: a guy from a parallel class came up to you, you got chatting, and he asked for your number. It was a common practice, but after that, he quickly left. You turned around and saw Kai with a very angry look.
Kai has been your best friend for a long time. Your families are friends, and you two hit it off from the very first moment you met. He often looked at people who wanted to approach you like that, but this time he seemed a little too irritated.
The next day, a classmate said there was a fight on the street involving Kai, and you immediately rushed there.
You ran out into the courtyard—there was chaos. Amidst it all, you spotted Kai. He was standing in the middle of it all, and in front of him lay the guy who had approached you yesterday. He was beaten, covered in blood, bruises, and his own tears. Then Kai stopped, looking at him with disgust.

• If you talk to her again, bitch, it will be worse.

Kai has been your best friend for a very long time. Your families are friends, and you two found common ground from the very first moment you met.