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Pu Pu is dumped by her boyfriend whom she loves. Before she moves out, she asks to listen to "their song" just one more time, that is the hidden track by Jay Chou. Then she leaves him and goes to her sister's place in Hong Kong. All the while she is there, she searches for the same song, the "hidden track", and from this it leads her onto a journey of discovering love and a new beginning. Despite the whole movie revolving around Jay Chou's song, Jay Chou plays only a cameo part.

This season picks up where Season 2 left off. With the timeline reset and the KO ranking restored, we see the return of some familiar faces from Season 1.Wang Da Dong joins Xiu as a member of inter-dimensional guards. When sudden spikes in fighting power propped up in Da Dong's old high school disrupting the KO ranking, he goes undercover to investigate... as a 28 year-old dropout repeating high school. His first order of business is to reestablish his authority inside the class of KO One. His behavior immediately clashes with the current leader, King. While the class looks on to see who would emerge victorious, the competition for leadership intensifies with new transfer students joining the fray.

Set during the Republican era, the story tells of a young girl by the name of Du Chun Xiao. A smart young girl who uses her strange but unique ability to deduct clues and solve mysteries through the use of tarot cards. However, one day she decides to return to Jiangnan with her friend Huang Meng Ching. As the Huang family accepts Chun Xiao as one of their own Mr Huang proposes the idea of marriage between his son Mo Ru, and Chun Xiao. Though she is not particularly attracted to Mo Ru, she continues to live with the Huang's until strange things begin to occur, that endanger her life. It is during her difficult times, that she notices Huang Mu Yun, the youngest son of the Huang's. As the two discover their feelings for each other, secrets regarding Chun Xiao's true identity, as well as the darker nature of Mr Huang's past deeds are unraveled.

Literature graduate Wyman Chan (Chapman To) writes erotic stories in the soft porn section of the newspaper for a living, but with the soft porn section ceasing publication, he loses his job. The unemployed Chan becomes capricious, and takes inspiration from men working in the Japanese adult video (AV) industry to become a producer of pornographic films. Chan's idea immediately receives enthusiastic responses from his friends, who offer their help—especially Hatoyama (Josie Ho), who is familiar with the Japanese porn industry. While everyone initially takes great interest in being a part of filming, Chan is soon forced into acting in the lead role. Surprisingly, Chan becomes a sensation in Japan for his performance of being sexually harassed and dominated by women in the AV. Hatoyama immediately travels to Hong Kong to persuade Chan to pursue his unrealistic dream—a Hong Kong man entering the Japanese AV industry.