Tax Question - Foreign Country (South Korea)

[adamukim]

Hello, 
I am not a U.S. citizen, and I am a Korean citizen with Korean citizenship. 

I lived and worked in the United States for 3 years after graduating college in the States. So, I have social security number (SSN). 

When I was working in the U.S., I filed taxes because I had income. I moved back to South Korea about 2 years ago. Even though I didn't earn any income in the U.S. last year, I still filed taxes in the U.S. because I just felt like I needed to file taxes like I did on my previous years.

Then, I thought about filing it this year. I didn't make any income in the United States. I am not living in the United States. I am not a U.S. citizen. I just have my social security number. 

The only thing is I have my Wyoming based LLC under my name, for which I already filed taxes a couple months ago. (I didn't make any income on that either) 

I filed taxes in Korea already.

Given this situation, a I still required to file taxes this year?

[DaveF1006]

No.  You do not have a US reporting requirement.

[adamukim]

I sold my stocks on Robinhood, but I didn’t make any profit,I sold them at a loss.
Do I still need to file taxes?

Also, when I start running my business next year, will I be able to file taxes then?
If I don’t file taxes this year, could that cause any issues later on?

[DaveF1006]

No. You still do not need to report your Robinhood sales this year. You earned the income as a foreign resident so you do not have  US reporting requirement. 

If you operate your business in South Korea, you still wouldn't have a US reporting requirement unless you live in the US.