English wording + Korean translation

[galerian_ash]

So, let's say you have a building that you need to fill with sleeping gas. Do you "insert" the gas? For me, the word insert needs to be coupled with something tangible -- like inserting a coin into a machine, for example. But I can't figure out what other wording to use here, other than "spray in" (which just sounds plain wrong).

Secondly, and a bit more straightforward, could anyone please help me translate some Korean? This is what I'm curious about:

'난 그녀석이랑 달라!'
장난? 그한마디로 끝임?