On page 91, there's an indication of net sales in KRW million, which is 61,396,284. Referring to ofx.com, the exchange rate (USD to KRW) was 1100.496106 as of 31 Dec 2018. Therefore, the net sales for year 2018 was 55,789,642,203.4 USD.
1 USD = 1100.496106 KRW
(Calculation: 61,341.7*10^6/1100.496106 = 55,740,042,754.86278)
pg. 12
"Financial Performance (Consolidated) 2018
(Unit: KRW billion)
Net sales 61,341.7"