The Value found on P.58_Financial Performance_ Sustaiability Report 2019
Revenue in 2019= 6284.3 Billion Korean Won/ Average exchange rate in 2019 = 5.39 Billion USD
(https://www.statista.com/statistics/647920/krw-usd-annual-exchange-rate/)
I used the value given on page no. 13 of Amorepacific 2019 Sustainability Report and the avg. conversion rate (1165.696) as per the methodology of the question https://www.ofx.com/en-gb/forex-news/historical-exchange-rates/yearly-average-rates/