The film tells the story of four friends who are about to turn 20 and go to the seaside to play, but they have no intention of being involved in a mysterious case, and their fate has changed dramatically overnight.
Fa Xiaolongfei, Shang Yu, Zhikong and Du Man, who are about to turn 20, decided to take a long-planned trip in order to bid farewell to Shang Yu. Long Fei, who first met, Shang Yu, who would rather join the army than go to college, and Yu Kong, who was tossed around by his mother, were all people who entered the university baseball department by connections. For this "free travel", they each put aside all the constraints in reality.
Four people who came to the seaside to play accidentally saved a strange woman in a dangerous situation and were suspected to be the "mastermind". After being told by the police, the parents who didn't know the inside story advised him to be more important than his friends, hoping to shift the responsibility to others. Under the constant persuasion of parents, the four people who insisted on friendship began to worry about their future and began to shake their hearts.