Four girls who have just entered the university campus, the funny and straightforward Lin Xiaobai, the cute and weak daughter Si Si, some weird memories in the classical quiet, the passionate Si Si, different provinces, different languages, but they are all performing infinitely wonderful things under the same roof. Who appears to break this atmosphere? Su San with a wicked smile, or Ye Qiao, who is calm and proud? It turns out that the good sisters are fake, who is really treating me well? The seeds of everything were planted many years ago. It's no one's fault, you just need to believe...