 Taking this occasion, An discussed territorial title matters with a Japanese governmental official, reminding him that Ulleungdo and Jasando (자산도, 子山島 sic; a scribal corruption of Usan-do 于山島/亐山島) are Korean territory.As a result, the bakufu issued prohibitions banning Japanese fishermen from travelling to Ulleng-do.This is called the First An Yong-bok incident.