Other people's "boy next door" is a gentle, considerate, sunny and warm big brother, while Ruan Mianmian's "boy next door" is a rebellious little devil who is a prince charming in person. Qingmei, who is about to mature, has a rebellious sweetheart who is three and a half years younger. Yan Yan, the main character who has no childhood sweetheart, was also caught because of a wall climbing, and they became lovers who could not explain the true and false. Although Mianmian tried her best to deny it, the whole school believed it. Since then, bickering and bullying have become a daily routine... 18-Year-old Mianmian, burdened with the guilt of abducting her younger brother, works hard to grow up in the youth campus!