Everyone has the opportunity to go to Hengjie when they are young. Most of them go to Hengjie to escape troubles and hide there all their lives. A Fei, a single parent, has a good relationship with his mother, but his mother is implicated in drug trafficking by her lover Lan Biao, whom she has just met, and is imprisoned; he seeks revenge on Lan Biao, but loses an eye as a result. In the end, revenge makes him hide in Hengjie to spend his days. Nana, who has lost her memory, is looking for Hengjie everywhere; in her fragmented memories, the image of A Fei keeps flashing. She is convinced that as long as she finds A Fei, she can get rid of the nightmare that troubles her. King meets Nana at the tram station. Nana asks King how to find Hengjie. King leads her lightly, but he feels very painful because Nana was originally her girlfriend, but now, Nana is facing him as if she is facing a stranger. On the basketball court, the lonely girl PS is silently waiting for A Fei, because she feels that they are both lonely people living in a cruel world. Four young people in Hengjie wander around in the alleys, looking for their own direction in the lustful and ugly Hengjie. Produced by Liu Weiqiang of "Infernal Affairs" and directed by Ye Weimin of "Young and Dangerous: The Thirteen Sisters of Hongxing", the film stars the passionate young man "A Fei" played by the popular Taiwanese singer Alan Ko, who wanders around in the alleys of Hengjie, a street full of lust and ugliness, looking for their own direction in life. Alan Ko is the son of the late actor Alan Ko. When he was a child, he starred in "Eight Happiness Comes to the Door" and "The Legend of Wesley" in the 1980s. He officially joined the music scene as a singer in 2005 and began to perform in the Taiwanese drama "Delicious Relationship" in 2007. This time is Alan Ko's first time to play the leading role in a Hong Kong movie, and he challenges the role of A Fei, a marginal teenager who is blind in his right eye. "A Fei" is one of several films shot in high definition that were planned by Andrew Lau and produced by Basic Pictures in 2007. Others include "A River and Lake" directed by Herman Yau, "School Graves" directed by Chin Man-chi, a campus thriller, and "Dangerous Man", an undercover film by Chung Siu-hung.