He later earned Ph.D. degree and became a professor in Chonnam National University where he had taught Japanese language to Korean students throughout the years.
His pen name was known to the Korean media, and it had been reported as early as 2001 that he had published books critical of Korea, such as his 1996 How to write anti-Japanese novels in Korea or his 2001 Outbreak of a Korea-Japan War?, which he acknowledged took an aggressive approach to their subjects and could be offensive to Koreans; however, he retained popularity as a commentator.
He stated that his goal in writing was to help both Japanese and Koreans overcome their historical conflict and develop closer relations.
[3] In June 2005, South Korean newspaper Dong-A Ilbo reported more shockingly on the books and essays in which he had submitted under his pen name Nohira [citation needed], including publications in rightist magazines; those of the works under his pen name were described as "degrading" to Korea, in contrast to those he wrote under his real name.
[1][6] A few months later, he returned to Japan to take up a post as a lecturer in Korean language at the Hokkai School of Commerce in Sapporo.