Hui-June worked as an economist for 30 years in Korea Rural Community Corporation (KRC) which has been a leading public agency in Korea for land and water development for agriculture projects. KRC was the first agency in Korea who introduced economic and financial analysis by recommendation of international institutions who provided project loans. Hui-June worked there as an economist. Later KRC participated in international projects through successful bidding where he could accumulate more my experience as an economist. Hui-June worked at Mekong River Commission (MRC) Secretariat as a project officer for agriculture and irrigation programs covering member states of Vietnam, Laos, Cambodia, and Thailand. Hui-June worked at Mekong River Commission (MRC) Secretariat as a project officer for agriculture and irrigation programs covering member states of Vietnam, Laos, Cambodia, and Thailand.