사계절이 · 사계절을
the four seasons
Example
한국에는 봄, 여름, 가을, 겨울 사계절이 있어요.
Korea has four seasons: spring, summer, fall, and winter.
Word parts
사 four+계 season+절 period
Literally 'four season periods'.
Good to know
Koreans often say 사계절이 뚜렷해요, 'the four seasons are distinct,' when describing Korea.