@chh18 

The H100 is a 2.4 GHz Wi-Fi device. According to my research, the channels supported for 2.4 GHz Wi-Fi in Hong Kong and South Korea are the same, so the H100 should be able to connect to Wi-Fi routers in South Korea without any issues.

If you are referring to purchasing a new Tapo SubG device in South Korea to connect to the H100 hub, upon checking, the Tapo SubG devices sold in both locations are US versions, so in this case, they can paired together.