Hi Sally!

Thank you for making your homework. Your sentences have good ideas with some corrections. Let's review them. ^^ 

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1.South Korea's traditional food is Kimchi.

~ We use the possessive form by adding apostrophe ( ' ) and -s. It is meant to refer that Kimchi is the traditional food of South Korea. 

2.South Korea has four seasons: Winter, Spring, Summer and Fall.

~ Let's enumerate the four seasons of Korea to give the sentence a better meaning.

3.I like Korea. CORRECT!