thank you for your help!
recently, i asked to my freind to recommend how to study english
he said "watch the american drama. I become quite fulent through watching those."
so, i watched that 'how i met your mother'
at first i watched that with korean subtitle
and next, with english subtitle
i can't sure it will be helping me, but it is sure that is very fun!
if you didn't watch that yet and have spare time, i recommend that