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

In the Alcohol average daily consumption rating Tonga holds position #121 ²⁰¹⁶ out of 189 and South Korea is #71 out of 189 ²⁰¹⁶.
Position of Tonga is better than position of South Korea.
Both countries holds average positions in the "Alcohol average daily consumption" rating. So Both sexes is an average for both Tonga and South Korea, compared to most countries of the World.

Referencies:

1. Alcohol average daily consumption ²⁰¹⁶ by WHO

   The countries in the rating sorted by 'Both sexes' in descending order.

   South Korea	'Both sexes' value is	34.6
   Tonga	'Both sexes' value is	23.1