Xuan Lin, a little girl whose mother died when she was 4 years old, met an older brother who was playing by the river. They made an appointment on the Ferris wheel and said that when they grew up, they would use the Ferris wheel necklace to identify each other. When Xuan Lin was 16 years old, she went to a college and met a man who owned the necklace. However, after Ling appeared, he felt that Ling was more like that big brother, but the necklace was not on Ling. She was confused. Who was the brother who coaxed her when she was a child?