Police are appealing for assistance to locate missing 23-year-old Geng Feng Shi.
The young man, who has connections in both Belfast and Killyleagh, was last seen on March 4 at around 6.40am at the Royal Victoria Hospital on Grosvenor Road, Belfast.
He is described as around 5 ft 9 ins tall with dark coloured receding hair.
When last seen he was wearing a dark coat with a hood, blue jeans, red trainers and a red baseball cap.
Police and his family are becoming increasingly concerned and would ask anyone with information to contact Musgrave CID on 101.