the green kitsune how do i think?
No problem, feel free to use your native language if it's easier, and it's a common one. I can probably machine translate it.
The one you want is the green kitsune/fox all the way on the left, Satin. He gives you a long fetch quest going back and forth through various NPCs in the room via hints, which I can see being difficult if English isn't your native language. BUT, you actually don't have to do that: you can skip the quest. Talk to him again, and when he gives you the text input box, type "you". He'll deny it the first time, so do it again, and then you'll get the key.