Diplomat David Straub told Yonhap News Agency this week that Pyongyang is raising its demands to free hostages.
Joo Won-moon tells CNN he doesn't know what charges he might face.
Kenneth Bae and Matthew Todd Miller are returning home after spending months in detention in North Korea, the U.S. government said on Saturday.
The 24-year-old American is serving a sentence of six years hard labor
As the trial of Matthew Todd Miller, 24, is set to start Sunday, his family and friends from Bakersfield CA keep mum