A girl named Gu Liangguoer and her two best friends. For those so-called pure and beautiful love, those maddening and funny crazy behaviors. Like a dog with a muzzle looking at a bone. However, later on, their understanding of love and this lovely earth came to light. Like a trace of blue in the sky, faint. But it has a different charm. The word "simple" has become so touching and endearing. The story will also kick off.