In 1984, he entered South Korea under a student visa with the guise of a Filipino researcher of Lebanese descent named Mohammad Kansu. He enrolled at the
Korean Language Institute at
Yonsei University, and then at
Dankook University in September 1984, becoming "the first international student in their doctoral history program". In 1988, he was offered a visiting professorship in Arabic Studies at Dankook, and became South Korea's "sole expert in Arabic Studies". and attended Seoul Central Mosque twice a month. He became a respected figure in the city's Muslim community and a household name in South Korea for his writing, columns, and lectures. In 1991, he wrote an excerpt for a middle school textbook published by the South Korean
Ministry of Education. Jeong smuggled information back to North Korea by using hotel fax machines to fax a North Korean agent stationed in Beijing. While in Daegu Hwawon Prison, In 2003, he was offered a teaching position at
Korea University, where he taught Islamic culture and medieval history. He received South Korean citizenship in 2005. In 2008, he founded the Korea Institute of Civilisation Exchanges, of which he was president at the time of his death. In 2011, he visited his hometown for the first time in 60 years. In 2022, he published a memoir,
People of the times, follow your calling. In contrast to some Silk Road scholars, Jeong suggested that the route's northern-most point was
Gyeongju,
Silla, rather than
Xi'an, China. ==Writings==