The Korea Observer has a video posted of a Korean man beating a woman on the street.

https://www.youtube.com/watch?v=PKLvQ7P4mc4

This incident shows a cultural difference in Korea many Americans may not realize.  In the US people would likely intervene to stop what was going on, however in Korea intervening and getting into an altercation could lead to a lawsuit.  That is why I recommend to foreign visitors and residents in Korea to not intervene in situations like this unless there are a whole bunch of Korean friends to act as witnesses.  The foreigner’s word against a Korean’s usually does not turn out well at the police station.  It is best to call the police and take video to give to the police like the Canadian that took this video did.