My plan to invest using cash

I'm thinking about investing in cash, and i'm considering investing in US bond ETF's.

 

However, i'm worried about the potential foreign exchange loss

since the current USD/KRW exchange rate is high.

 

I'm concerned that if i convert my money into dollars and invest in US bonds, 

I might face a loss later due to exchange fluctuations.

 

Is there a better way to invest?

 

I think KR bond ETFs might be the right place to invest.