North Korea is 朝鮮 (chao2xian3).South Korea is 韓國 (han2guo2).
Han guo
Origami is a Japanese word, and I don't know how you would say/write it in Chinese.
halmeoni is the pronounce 할머니 to write in hangul
You say weirdo in Chinese like this: guai In Chinese character you write this word like this: 怪
You say "Korea" - like the country, in Greek it's written as κυρία.
"龙" is Dragon in Simplified Chinese "龍" is Dragon in Traditional Chinese
Yes, Chinese citizens can apply for a Korea transit visa for their travel through Korea.
the russians and chinese did
When The President Of Korea got Some Anal Up His Butt - From The Chinese Troops
写 [xiě] or 书写 [shū xiě]
Here is how to say "I see you" in Chinese: 我看你 I've added a related link on how to do this.
Yes, Chinese citizens need a visa to visit South Korea.