The Wu family and the Ye family have been close friends for generations. Ye Xin'er has never argued with Ye Zixing since she was a child. Ye's mother is also very partial. Wu Shixun and the two "sisters" grew up together. Ye Xin'er never expresses her love for Wu Shixun, but Wu Shixun has special feelings for her... (The story goes from campus to city, with deep sadomasochism.)