Kilju is like a drink that some people make at home using sugar, water, and yeast. It's kind of like a magic potion because the yeast eats the sugar and makes bubbles that turn into alcohol.
Okay, so let's pretend you have a jar. You put some sugar and water in it and mix it up. Then you sprinkle in some yeast which is like tiny little creatures that you can't see without a microscope. They start to eat the sugar and make carbon dioxide (bubbles).
Over time, the bubbles get bigger and bigger until they can't fit in the jar anymore. This is when you might put a balloon or something over the top of the jar to catch all the bubbles.
After a few days, the yeast has eaten all the sugar and turned it into alcohol. This is what makes kilju taste funny and makes you feel a bit dizzy if you drink too much of it. It's important to remember that kilju can be dangerous if it's not made correctly, so it's best to only try it with an adult who knows what they're doing.