如果我去韓國讀書, 手持什麼證件會待遇會好D?BNO 還是特區護照?

The above is wrong!! My friend using BNO had to apply for a student visa even though she decided to stay less than 90 days. If she takes her SAR Passport with her, she can go there without the need of a visa because she can stay 90 days without a visa.
If you want to study in Korea and you only want to stay for less than 90 days, use you SAR Passport and you may go there without a visa. But if you are not sure whether you would stay for a longer period of time, you better apply for a visa for SAR Passport or BNO Passport.

This is the information from the Official Site of Kroean Tourism: -Visa Guidelines
Citizens of Hong Kong coming to Korea are permitted to enter with no visa according to the Visa Exemption Agreement.

- Visitors who have a SAR Passport can stay no more than 90 days without a visa.
- Visitors who have a BNO Passport can stay no more than 30 days without a visa.

For the renewal of BNO: BNO一本32頁的成人護照（十六歲及以上）價錢: ＄970，48頁的價錢: ＄1,150. Very expenisvive!!

手持特區護照證件會待遇會好dd nice d because is hong kong peoper