"Are the short tourists Chinese, Korean or Japanese?"

Translation: Az alacsony turisták kínaiak, koreaiak vagy japánok?

[mizinamo]

Is there an explanation why it is kínaiAk, koreiAk but japánOk? I thought adjectives took -ak in all cases?

[Findil]

Adjectives with the name of a country as their stems take -ak (or -ek if they're front-vowel words):

• Korea + -i + -ak
• Kína + -i + -ak
• Amerika + -i + -ak
• Egyiptom + -i + -ak

Demonyms that don't have this structure take -ok (or -ök/-ek if they're front-vowel words):

• japán + -ok
• angol + -ok
• skót + -ok
• dán + -ok

(For some reason there's no such word as "japáni". I can't take of any other country that can't take the -i suffix)

[asuntree]

When do you need to decline the adjective to the noun?

[Findil]

The only time you don't decline is when the adjective is directly in front of a noun, like alacsony in this sentence.