- https://en.wikipedia.org/wiki/Crime_in_South_Korea
Supply of drugs has also historically been limited according to the following article that goes over drugs in South Korea at length:
- https://www.koreaexpose.com/drugs-south-korea-a-silent-crisi...
The quantities listed in https://en.wikipedia.org/wiki/Capital_punishment_in_Singapor... seems higher than what a user would have on them.
But at least they manage to make their prohibition policy actually effective: drugs are hard to get, and not a lot of people are actually behind bars or executed for trading.
(Compare with eg the US which incarcerates a lot of people, but the drug trade goes on regardless.)
Anyway, I just wanted to point out that there are many variables to consider, and a lot of them are less obvious, or less quantifiable.
[1] https://en.wikipedia.org/wiki/List_of_countries_by_suicide_r...
This is a much more complicated issue than numbers from two countries could possibly tell.
[1] http://www.unodc.org/wdr2017/field/3.1_Mortality.xls