Oigyeseo on Ulemae (1986)

A woman and a boy of about 10 are in the forest looking for someone. When she gets frightened by a man she drops down, accidentally pulling the boy's pants down, exposing his penis. They stand there as the friendly man comes to them. The boy is still exposed and the man crouches down in front of him and points out his penis, still visible to us. The boy then pulls up his pants and runs off.