One game I use a lot is like taboo:
Divide the class into two teams. One person from each team stands at the front with their back to the whiteboard and mustn't look. The teacher writes a word or phrase or draws a picture and the rest of the class must describe it for their teammate to guess. The first person up the front to raise their hand and guess correctly wins a point.
Rules are: no actions allowed, no Korean speaking allowed at all, the class must raise their hand to say a sentence in English (otherwise it's easy for them to drop easy hints).
It's easy to enforce the rules by giving a point to the other team when someone breaks a rule.
The students usually get all riled up about this game.