출입going in and out; entry 출입국departure; entry 입구entrance 출입coming and going 입국entering a country 입수to obtain 입구entrance; entry; gate 입원hospitalization 입장권admission ticket; entrance ticket 입학admission to a school; entrance into a school

성castle 토성wall of earth; mud wall 고성old castle 농성sit-in; sit-down strike 도성capital city; capital 불야성being nightless; being all-night 성문castle gate 성벽rampart; castle wall 성주castellan; chatelain 철옹성impregnable fortress