"새는 겨울에 남쪽으로 가요."

Translation: Birds go south in winter.

[bluefairy5]

Birds go south in the winter.

[fir72405]

Southwards should be accepted

[honeyrbw]

"Birds go South in winters" is not correct?

[bluefairy5]

You have made winter plural.

[nurulujung]

Birds in the winter go south should be accepted