südkoreanisch
South Korean
Relating to the Republic of Korea (South Korea), its people, language, or culture; originating from South Korea.
Der südkoreanische Film „Parasite“ hat einen Oscar gewonnen.
The South Korean film 'Parasite' won an Oscar.

South Korean
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South Korean
Relating to the Republic of Korea (South Korea), its people, language, or culture; originating from South Korea.
Der südkoreanische Film „Parasite“ hat einen Oscar gewonnen.
The South Korean film 'Parasite' won an Oscar.

Adjectives that describe origin are often formed by adding the ending '-isch' (-ish/-an) to the name of the country or region. This turns 'Südkorea' (South Korea) into the adjective 'südkoreanisch' (South Korean).
Ich interessiere mich für die südkoreanische Geschichte.
I am interested in South Korean history.
Although the adjective is derived from a proper noun ('Südkorea' — South Korea), it is written in lowercase in a sentence as long as it is not part of an official name. This is an important rule for all origin adjectives ending in '-isch'.
Die südkoreanische Flagge hat vier schwarze Trigramme.
The South Korean flag has four black trigrams.
The adjective is often connected with the country's internationally known exports. These include 'südkoreanische Popkultur' (South Korean pop culture/K-pop), 'südkoreanische Küche' (South Korean cuisine/Kimchi), and 'südkoreanische Technologie' (South Korean technology/smartphones, cars).
Südkoreanische Hautpflegeprodukte sind weltweit sehr beliebt.
South Korean skincare products are very popular worldwide.
Korean
'koreanisch' and 'südkoreanisch' can both describe something from Korea. The difference is in how specific they are. 'koreanisch' is more general and can refer to Korea as a whole, the culture, or the language. As 'Koreanisch', it means the language. 'südkoreanisch' is more specific and refers explicitly to South Korea. The words can be confused because in everyday speech people often simply say 'koreanisch', even when they actually mean South Korea. If the difference between North and South Korea is important, 'südkoreanisch' is clearer.

Für das Projekt hat Lena einen südkoreanischen Film ausgewählt.
For the project, Lena chose a South Korean film.
Im Supermarkt kauft mein Bruder koreanische Nudeln.
My brother buys Korean noodles at the supermarket.