Do you mean you are having problem because you used to live in the US and have a ss number ?
I'm not familiar with this situation so you might be right.
But as a South Korean resident what you need to register with an american broker should be a valid South Korean utility bill, not a US one. Than you would pay the cap gain tax, if any, to the South Korean government, no matter which market you trade (Korean, US, European or HK)
Check interactivebrokers, you can go through their online registration, they are a very good fit for international traders, and offer US ande HK equity markets as well as south korean futures, as well as several more markets:
https://www.interactivebrokers.com/en/main.php
I'm not familiar with this situation so you might be right.
But as a South Korean resident what you need to register with an american broker should be a valid South Korean utility bill, not a US one. Than you would pay the cap gain tax, if any, to the South Korean government, no matter which market you trade (Korean, US, European or HK)
Check interactivebrokers, you can go through their online registration, they are a very good fit for international traders, and offer US ande HK equity markets as well as south korean futures, as well as several more markets:
https://www.interactivebrokers.com/en/main.php
