Although the Korean kingdom restricted the port to Koriwasen to enter the Busan Inlet (釜山浦) and Jepo (薺浦) (Chinkae City, Gyengsangnam-do (South Gyeongsang Province) 慶尚南道鎮海市) in 1400 but it was not completely observed; and the Korean kingdom required Koriwa to bear gyojo (passport) issued by the lord of their residence in 1407.
1400年、朝鮮王朝は興利倭船の入港場を釜山浦・薺浦（慶尚南道鎮海市）に限定するが徹底されず、1407年に居住地領主の行状（渡航証明書）の所持が義務化される。