Koriwa were originally wako; therefore, they were cunning fellows to the Korean kingdom such that some of them raided Ming and brought their pillage to Korea to trade with Koreans, or were on board bearing arms and traded in their pillage at strictly guarded places and conducted raids as wako on the poorly guarded places.
興利倭は倭寇の転身したものであり、明で倭寇を働きその略奪品を持って朝鮮へ交易に訪れる、あるいは船中に武器を携帯し防備の厚い所では交易を行う一方、防備の薄い所では倭寇と化す者もあり、朝鮮王朝にとって油断のならない相手であった。