Its about Luo Xi. She has just entered the university because of her high school experience. She became a "bun girl", and Li Wei accidentally discovered that Luo Xi was the same year. Saved their "heroine heroes", in order to help Luo Xi find his own self, a series of youth "anecdote" occurred between them. But there is a secret, friendship, love and affection between the four of them, how should they choose? Watching is full, sometimes sweet to the dog, sometimes painful to the heart, this is the sour and bitter post-90s youth.