From a review of the fine Google Finance Website and financial statements in company investor relations websites, I found 10 Companies headquartered in South Korea with stock market caps now of more than South Korean Won 20 trillion and which had available financial statements for all years. The South Korean Won is worth US$.00087.
I excluded a South Korean Utility Company.
Below here are the reported Earnings (Losses) From Continuing Operations for each of these 10
largest South Korean Companies for all years from 2007 to 2016: