Lee Hyori has been long known to be vegetarian. Not only does she lead animal protection campaigns, but she is also known to be an activist speaking up against environmental issues.

It has been revealed that Lee Hyori's mother-in-law is making extraordinary efforts for her daughter-in-law. Lee Hyori's mother-in-law actually made a surprise appearance on the KBS2 docu-variety show 'Korean Food Table.'

During the show, Park Jong Sook, a natural cuisine researcher, revealed that Lee Hyori's mother-in-law was her best student.

Lee Hyori's mother-in-law explained that she decided to learn about natural cooking because of her daughter-in-law. She explained, "Hyori is vegetarian. So I wanted Hyori to try some natural foods, so I decided to learn."

Meanwhile, Lee Hyori showed her visiting the flea market with her mother-in-law and spending quality time together back in 2016.