Lin Zuzhuang (Guang Liang), a 15-year-old gifted Taiwanese boy, has been curious and distressed about sex since he was a child because his penis is larger than others. Under the guidance of the rental bookstore owner Zheng (Chen Sheng), he entered the world of pornographic books and became a pornographic book fanatic. Even the school counselor (Huang Jiaqian) shook his head and was helpless. His life was closed. Apart from pornographic books and Boss Zheng, he had no other friends. He didn't even notice the love of the runaway girl Lin Xiaoying (Liu Honghua) who had been secretly in love with him and secretly put tea eggs for him to eat every day in school. One day, Boss Zheng suddenly passed away, leaving him a key and a house number. He found a secret passage that could not be seen from the sky. There was a peeping mirror at the other end of the secret passage, which could see through the room of a young police couple (played by Dai Liren and Shibata Aiko). Here he witnessed the perverted voyeuristic fantasy of the pornographic book fanatic Boss Zheng, and learned about his secret crush that had been unknown for many years. He suddenly realized that sex is not equal to love, and sex with love is the most perfect love elixir in life. So he began to look back for the true love in his life. The true love journey of the most crazy and interesting A-book boy in Taiwan has begun vigorously.