A : Hello, May I speak to Cheol-su?
    -안녕하세요.철수와 통화할수 있을까요?

B ; He's in bed now. Shall I wake him up?
   -자고있는데 깨워드릴까요?

A ; No, thanks. I'll call him later.
    -괜찮아요. 나중에 걸께요