 He followed that with leading roles in the revenge court thriller "The Scales of Providence", and the post-war film "Once Upon a Time in Seoul".The latter, titled "Boys Don't Cry" in Korean, is about two orphaned friends (played by Song and Lee Wan) who become involved in the black market to escape poverty.Song had to lose 7 kilograms (15.4 pounds) and shave his head for his role.