No gore. The extent of a violence is that of a teenage boy repeatedly kicking a downed, coughing, struggling, nearly-incapacitated grown man, after the boy had used his palm to strike the then-standing man on the head, causing the man to fall to the floor. The boy even steps on the man's face and lips, as if to muffle or suffocate him.
The only other violence is just one scene of a grown man slapping a teenage boy on the cheek. Prior to such a slap, the two were merely playing around, simulating fistfight or boxing practice, but the boy accidentally knocked the cigarette out of the grip of the man's lips. However, throughout the movie the man does mildly behave somewhat like a bully toward the boy, using various restraint moves against him while being intimidating at times, for the boy seeming too "soft".
Two men mildly strong-arm a man into the backseat of an automobile. The context is vaguely coercive, like arrest or abduction. This apparently causes some emotional distress in a teenage boy who is effectively momentarily abandoned away from home as a result.
In just one scene, a teenage boy exhibits a brief tantrum in a public place: overturning a table and briefly cursing at the fellow cafe patrons, before trotting off away from the site. He throws a few other tantrums, throughout the movie, but they are not particularly threatening, let alone violent.