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He was there, he's always there. No matter the time, whether right or wrong, he knows everything.
Nobody notices him except for his cousin, but she always had, they were raised together. She had to deal with his silence and with his adventurous personality. She only called attention to him when he wanted it, otherwise, he was never noticed, even after he was added to the gang along with her.
That was, until the new guy came along. He causes trouble, but perhaps that's why the silent one notices him as well.