There is no source available to support the claim that a combination of chloroquine diphosphate salt and zinc was prescribed in South Korea.
The first case of the coronavirus was reported in South Korea in January 2020. As of March 31, 2020, the total number of confirmed cases in South Korea stood at 9786 and on March 31, 2020, the number stood at 9661. There was an increase of 125 cases in one day and according to these figures, there is no decrease in COVID-19 cases in South Korea.
The COVID-19 pandemic has given rise to a lot of potentially dangerous misinformation. For reliable advice on COVID-19 including symptoms, prevention and available treatment, please refer to the World Health Organisation or your national healthcare authority.