Dear Mei,
How about you do key word marketing by yourself.
We thought you that you need to pay higher cost if Garmin want be the top.
We could finish key ward marketing follow as your requirement.
Even though it will takes time because Naver collect the data through many different ways.
Naver collect the data not only key word but also through magazine,news.internet,blogs from users,event as well as long term history of marketing etc.