A Korean who grew up and lived in Korean speaks the Korean language well. Even if a Korean speaks the Korean language well, all of them are not good at teaching the language. The reason is that, speaking the language and teaching it is different. So, I think the teaching skill is very important for teachers.
The reasons I will teach well is...
1) I am teaching my kids, Korean school, and Sejong Hakdang for many years. While I was teaching for many years, I learned how to teach a second language as Korean and English.
2) A good thing about me is I am good at teaching and I love my student.
3) I also know how it feels to learn a new language because I learned a second language English.