In 1997, when first-graders-to-be Zhang Yixing and Cheng Hui Ru first met officially, there was nothing to tell about. They were just another neighborhood kids who lived across the street from each other. They were practically ignoring each other cause Hui Ru had her drawing book and crayons to keep her company and Yixing had TV, Jimmy Lin, foods, his soccer friends, and his grandma's grumbles to keep him busy. Until the night before the first school day.

"We will go to school with Hui Ru tomorrow, treat her well, will you?" said grandma. Then she continued about how Yixing should take care of Hui Ru and thought of her as his little sister, cause apparently Hui Ru was not just little girl who lived across the street anymore, she was now a little girl who lived across the street whose mother died in train accident and it's so pitiful to live her alone with her dad. Yixing complained though, it's like getting new homework. But at least, Hui Ru was not like his female cousins, who would whine here and there everytime they came to grandma's house for celebrating New Year.

This pseudosibling, who soon would be accustomed of each other's presence, then lived their life just like other kids who also had childish ambitions, petty problems to cry about, big crush on good looking seniors, fights with parents, and endless homeworks and exams. But little did they know, time changed a thing (or few things) between them, they did not even realize it when one of them could not see the other in the same way anymore, but the latter seemed clueless about it and still announced it proudly that "We're sibling!".