The Outsiders.

In 1985, senior high school student A-Qing was found fornicating with a staff member at school and got expelled. His deeply humiliated veteran father has since cast him out of the family, leaving him with nowhere to go but the refuge of his "own kind" at Taipei New Park. In the park, A-Qing encounters a mature man Long Zi (Dragon) and is attracted to him. However, A-Qing also gets daunted by the story of Long Zi committing a crime of passion.