Yes, it modifies kimchi.
The opposite of mild is spicy or hot, something like that.
I like my kimchi mild.
(Does 'mild' modify kimchi? What is the opposite of 'mild'?)
3 answers
1. I like my kimchi which is mild.
2. I like mild kimchi.
(Thank you. What about the sentences? Are both the same?)
2. I like mild kimchi.
(Thank you. What about the sentences? Are both the same?)
Yes, they are correct, and they're interchangeable, too.