 Between 1987 and 2001 he was CEO and president of Yuyu Industrial Co. Ltd.Since 1994 he has served as chief director of foundation at Sejong University.Yu is also serving as vice-president of WSMI (World Self Medication Industry) Asia-Pacific Region since 1993 and has served as vice-president of KPMA (Korea Pharmaceutical Manufacturers Association) from 1995 to 2000 and KPMA chairman of the board from 2001 to Feb 2003.