Similar and different from Mattia and Alice, he is a young genius with a retarded twin sister. This sister is an irrefutable burden to him, so he once let her stay in the park in order to get rid of her, hoping that she would get lost. Of course, he didn't expect that she would really disappear. From then on, he became silent, self-mutilated and rejected the whole world. He is the second prime number.
But one day, Alice caught a glimpse of Mattia in the street and was suddenly attracted by the boy with a bandage on his hand, so she approached him and became friends with him, completing each other in a strange way and supporting each other in her youth. It was not until Mattia graduated from university that she went to Germany to study mathematics and parted ways.
After Mattia went to Germany, Alice got married and divorced in her hometown. Their relationship was never mentioned in her brief correspondence with Matia until she saw a girl who looked like Matia in the hospital. At that moment, she decided that it was Matia's long-lost sister, so she wrote a letter to let Matia come back, and Matia came back immediately, even though she just wrote, "You must come." These five words didn't even say a reason, but Mattia came anyway. She flew over the border, not far from Wan Li. They met again, chatted and realized that they were still two fragile people, so Mattia returned to Germany, and Alice didn't say anything until the end. At this point, the cold and hot feelings between them finally disappeared.
The loneliness of prime numbers is not a happy story, but it has an unexpected impact on the soul, because who in this world has not experienced loneliness? Even in the largest crowd, even in the company of the most considerate friends, loneliness will suddenly attack your heart at some point, making you feel cold and unable to break free. Everyone is unique and will experience loneliness.