The Gaze of a Beautiful Boy (2003)

Fumiya, a beautiful boy with no fixed address, sells his body to random men in the park. One day, he is in trouble but is saved by a middle-aged university professor, who sets him on a new life. However, when he finds that the professor has the same scar on his forehead as Fumiya, he learns a shocking truth... Having learned about the lives of men who live for love across time, Fumiya walks out proudly into the sunlight filtering through the trees.