Statement:
An average person in South Korea drinks less alcohol than in Iran

In the Alcohol average daily consumption rating South Korea holds position #71 2016 out of 189 and Iran is #9 out of 189 2016.
Position of South Korea is better than position of Iran.
Iran is leader of the "Alcohol average daily consumption" rating. So people in Iran are more likely to experience problems related to the consumption of alcohol in social, healthcare, and economical areas, compared to South Korea

Referencies:

  1. Alcohol average daily consumption 2016 by WHO
    The countries in the rating sorted by 'Both sexes' in descending order.
    Iran 'Both sexes' value is 61.4
    South Korea 'Both sexes' value is 34.6