All three, to different extents. I only know a few basic words and phrases in Chinese, like 我的名字是穆里希库. But as for the other two, 日本語と韓国語を勉強しているので、한국어와 일본어를 조금 할 수 있어요.
Are there any languages that you're studying, or that you want to study?
_________________
It is easy to go down into Hell;
Night and day, the gates of dark Death stand wide;
But to climb back again, to retrace one's steps to the upper air –
There's the rub, the task.
– Virgil, The Aeneid (Book VI)