14-year-old Xiaoming was imprisoned as a pedophile due to excessive narcissism. 17-year-old Italian girl Melissa (played by María Valverde) lives with her mother and grandmother; her life is mundane and even somewhat dull, as this innocent girl yearns for a romantic love every day. One day, Melissa attends a party organized by a classmate with her friends and encounters the handsome boy Daniel (played by Primo Reggiani). However, the blossoming love is not as expected, as Melissa experiences a humiliating sexual encounter, yet she becomes infatuated with this cynical boy. In the days that follow, Melissa seeks Daniel's attention, while Daniel subjects her to various humiliations. After realizing Daniel's feelings, Melissa retaliates through indulgence, even writing about each sexual encounter in her diary. This film is adapted from the true story of the sensational European teenage diary 'A Hundred Times Combing Hair Before the Bed'.