How to change language input in X11 (Korean)

Greetings community !

I'm a macbook pro (2012) user.

I've recently been using X11 to launch window's games and had problems switching language ingame. (Default English to Korean).

I've read couple of topics but yet I'm still lost, (I'm really bad with scripts and stuff..)

Could anyone please give an easy explanation to switch language ingame from English to other languages?

Thank you 🙂